diff --git a/apps/desktop/src/gui/application/gui_application.cpp b/apps/desktop/src/gui/application/gui_application.cpp
index 6d9802d6..facc55f0 100644
--- a/apps/desktop/src/gui/application/gui_application.cpp
+++ b/apps/desktop/src/gui/application/gui_application.cpp
@@ -1493,6 +1493,10 @@ void GuiApplication::BindMainCallbacks(bool gallery_window) {
     SyncAnnouncements();
   });
   main->on_refresh_announcements([this] { announcements_.Refresh(); });
+  main->on_read_all_announcements([this] {
+    announcements_.ReadAll();
+    SyncAnnouncements();
+  });
   main->on_open_announcement_link([this](slint::SharedString link) {
     const std::string url(link);
     if (announcement_text::IsWebUrl(url)) OpenUrl(url);
@@ -2637,6 +2641,7 @@ void GuiApplication::SyncAnnouncements() {
           revision == ui_->announcement_selected_revision) {
         selected_found = true;
         main->set_announcement_selected_id(row.id);
+        main->set_announcement_selected_revision(row.revision);
         main->set_announcement_selected_title(row.title);
         main->set_announcement_selected_body(
             announcement_text::Format(item["body"].get<std::string>()));
@@ -2648,6 +2653,7 @@ void GuiApplication::SyncAnnouncements() {
     if (!selected_found) {
       ui_->announcement_selected_id.clear();
       main->set_announcement_selected_id("");
+      main->set_announcement_selected_revision("");
       main->set_announcement_selected_body(slint::StyledText{});
     }
     main->set_announcements(
diff --git a/apps/desktop/src/gui/assets/fonts/generate_message_spacing_font.py b/apps/desktop/src/gui/assets/fonts/generate_message_spacing_font.py
new file mode 100644
index 00000000..f333275e
--- /dev/null
+++ b/apps/desktop/src/gui/assets/fonts/generate_message_spacing_font.py
@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+"""Regenerate message_spacing.ttf with fontTools (only needed for regeneration).
+
+Slint 1.17 pins line height to the requested font's ascent, descent and leading,
+but StyledText does not expose line-height. This metrics-only font supplies 1.5em
+line boxes without replacing any visible glyphs: Slint's normal system fallback
+fonts still render the text and links. Use this family for message and release-note
+bodies without changing the typography of other controls.
+"""
+
+from pathlib import Path
+
+from fontTools.fontBuilder import FontBuilder
+from fontTools.pens.ttGlyphPen import TTGlyphPen
+
+
+def main():
+    font = FontBuilder(1000, isTTF=True)
+    glyphs = [".notdef", "zeroWidthSpace"]
+    font.setupGlyphOrder(glyphs)
+    font.setupCharacterMap({0x200B: "zeroWidthSpace"})
+    font.setupGlyf({name: TTGlyphPen(None).glyph() for name in glyphs})
+    font.setupHorizontalMetrics({name: (0, 0) for name in glyphs})
+    font.setupHorizontalHeader(ascent=1000, descent=-250, lineGap=250)
+    font.setupOS2(
+        version=4,
+        sTypoAscender=1000,
+        sTypoDescender=-250,
+        sTypoLineGap=250,
+        usWinAscent=1000,
+        usWinDescent=250,
+        fsSelection=0xC0,  # Regular, use typographic metrics.
+    )
+    font.setupNameTable({
+        "familyName": "CrossDesk Message Spacing",
+        "styleName": "Regular",
+        "uniqueFontIdentifier": "CrossDesk-Message-Spacing-1.0",
+        "fullName": "CrossDesk Message Spacing",
+        "psName": "CrossDeskMessageSpacing-Regular",
+        "version": "Version 1.0",
+        "copyright": "Copyright (c) 2026 by DI JUNKUN, All Rights Reserved.",
+    })
+    font.setupPost()
+    # Fixed timestamps keep the generated asset reproducible.
+    font.font["head"].created = font.font["head"].modified = 3874867200
+    font.font.recalcTimestamp = False
+    font.save(Path(__file__).with_name("message_spacing.ttf"))
+
+
+if __name__ == "__main__":
+    main()
diff --git a/apps/desktop/src/gui/assets/fonts/message_spacing.ttf b/apps/desktop/src/gui/assets/fonts/message_spacing.ttf
new file mode 100644
index 00000000..a1716c88
Binary files /dev/null and b/apps/desktop/src/gui/assets/fonts/message_spacing.ttf differ
diff --git a/apps/desktop/src/gui/assets/localization/localization_data.h b/apps/desktop/src/gui/assets/localization/localization_data.h
index 52139d78..657d5e83 100644
--- a/apps/desktop/src/gui/assets/localization/localization_data.h
+++ b/apps/desktop/src/gui/assets/localization/localization_data.h
@@ -23,10 +23,11 @@ struct TranslationRow {
   X(messages, u8"消息", "Messages", u8"Сообщения") \
   X(message_unread, u8"未读", "Unread", u8"Не прочитано") \
   X(message_read, u8"已读", "Read", u8"Прочитано") \
+  X(message_read_all, u8"全部已读", "Mark all as read", u8"Отметить всё прочитанным") \
   X(message_empty, u8"暂无公告", "No announcements", u8"Нет объявлений") \
   X(message_select, u8"选择公告查看详情", "Select an announcement to read", u8"Выберите объявление") \
   X(message_loading, u8"正在加载…", "Loading…", u8"Загрузка…") \
-  X(message_read_save_error, u8"无法保存本地阅读状态，请重新打开公告重试。", "Unable to save reading status locally. Open the announcement again to retry.", u8"Не удалось сохранить статус чтения. Откройте объявление снова.") \
+  X(message_read_save_error, u8"无法保存本地阅读状态，请重试。", "Unable to save reading status locally. Please try again.", u8"Не удалось сохранить статус чтения. Повторите попытку.") \
   X(message_close, u8"关闭", "Close", u8"Закрыть") \
   X(message_delete, u8"删除", "Delete", u8"Удалить") \
   X(message_delete_title, u8"删除公告", "Delete announcement", u8"Удалить объявление") \
diff --git a/apps/desktop/src/gui/runtime/announcement_inbox.cpp b/apps/desktop/src/gui/runtime/announcement_inbox.cpp
index 721246e3..1183e7f9 100644
--- a/apps/desktop/src/gui/runtime/announcement_inbox.cpp
+++ b/apps/desktop/src/gui/runtime/announcement_inbox.cpp
@@ -154,6 +154,29 @@ bool AnnouncementInbox::Read(int64_t id, int64_t revision) {
   }
   return false;
 }
+bool AnnouncementInbox::ReadAll() {
+  std::lock_guard<std::mutex> lock(mutex_);
+  if (catalog_revision_ < 0) return false;
+  auto updated = reads_;
+  // Use the complete catalog, including announcements whose bodies have not
+  // been paged in. Persist once before changing any visible reading state.
+  for (const auto& [id, revision] : catalog_) {
+    if (!IsDismissed(id, revision)) updated[id] = revision;
+  }
+  if (updated == reads_) return true;
+  if (!SaveLocalState(updated, dismissed_)) {
+    state_.read_save_failed = true;
+    ++state_.version;
+    return false;
+  }
+  reads_ = std::move(updated);
+  state_.read_save_failed = false;
+  state_.delete_failed = false;
+  UpdateReadingState();
+  ++state_.version;
+  return true;
+}
+
 bool AnnouncementInbox::IsDismissed(int64_t id, int64_t revision) const {
   const auto found = dismissed_.find(id);
   return found != dismissed_.end() && found->second == revision;
diff --git a/apps/desktop/src/gui/runtime/announcement_inbox.h b/apps/desktop/src/gui/runtime/announcement_inbox.h
index 3fee9093..7efc01f6 100644
--- a/apps/desktop/src/gui/runtime/announcement_inbox.h
+++ b/apps/desktop/src/gui/runtime/announcement_inbox.h
@@ -38,6 +38,7 @@ class AnnouncementInbox {
   void Refresh();
   void LoadMore();
   bool Read(int64_t id, int64_t revision);
+  bool ReadAll();
   bool Dismiss(int64_t id, int64_t revision);
   nlohmann::json TakePendingRequest(std::chrono::steady_clock::time_point now =
                                         std::chrono::steady_clock::now());
diff --git a/apps/desktop/src/gui/ui/main_window.slint b/apps/desktop/src/gui/ui/main_window.slint
index 564ba9bd..405f54fa 100644
--- a/apps/desktop/src/gui/ui/main_window.slint
+++ b/apps/desktop/src/gui/ui/main_window.slint
@@ -5,13 +5,14 @@ import { DeviceCardActions, DeviceCardStyle } from "device_card_actions.slint";
 import { DeviceGroupDialog, DeviceGroupOption } from "device_group_dialog.slint";
 import { GalleryView, GalleryTile, GalleryRecentDevice, GalleryActionDevice } from "gallery_view.slint";
 import { GalleryNetworkDialog, GalleryNetworkDevice } from "gallery_network_dialog.slint";
-import { SettingsButton, SettingsSelect, SettingsGroup, SettingsRow, SettingsToggleRow } from "settings_controls.slint";
+import { SettingsDialog, SettingsButton, SettingsSelect, SettingsGroup, SettingsRow, SettingsToggleRow } from "settings_controls.slint";
 import { GallerySettings } from "gallery_settings.slint";
 import { GroupFilter } from "group_filter.slint";
 import { ScrollView } from "std-widgets.slint";
 import { RoundedLineEdit } from "rounded_line_edit.slint";
 import { AnnouncementItem, MessagePanel, MessageStrings } from "message_panel.slint";
 import { FontAwesomeIcons, IconButton, CompactComboBox, ImGuiCheckBox, MiniToggleSwitch, CompactButton, PrimaryButton, SecondaryButton, ToggleSwitch, SectionTitle, DialogSurface, ImGuiLineStyle, ImGuiFontStyle } from "common.slint";
+import "../assets/fonts/message_spacing.ttf";
 
 export struct RecentConnection {
     remote-id: string,
@@ -344,6 +345,7 @@ export component MainWindow inherits Window {
     in property <bool> announcement-loaded;
     in-out property <bool> messages-open: false;
     in property <string> announcement-selected-id;
+    in property <string> announcement-selected-revision;
     in property <string> announcement-selected-title;
     in property <styled-text> announcement-selected-body;
     in property <string> announcement-selected-date;
@@ -352,6 +354,7 @@ export component MainWindow inherits Window {
     callback open-announcement-link(string);
     callback delete-announcement(string, string);
     callback refresh-announcements;
+    callback read-all-announcements;
     callback load-more-announcements;
     in property <bool> update-available: false;
     in property <UpdateCheckStatus> update-check-status: idle;
@@ -500,6 +503,10 @@ export component MainWindow inherits Window {
         if root.messages-open { focus-sink.focus(); }
     }
 
+    changed about-open => {
+        if root.about-open { focus-sink.focus(); }
+    }
+
     reset-remote-id => {
         root.remote-id-input = "";
         remote-id-editor.focus();
@@ -713,6 +720,10 @@ export component MainWindow inherits Window {
                     }
                     return accept;
                 }
+                if root.about-open && !root.update-open {
+                    if event.text == Key.Escape { root.about-open = false; }
+                    return accept;
+                }
                 if root.messages-open {
                     if event.text == Key.Escape { root.messages-open = false; }
                     return accept;
@@ -1477,14 +1488,14 @@ export component MainWindow inherits Window {
     }
 
     if root.messages-open: Rectangle {
-        background: #00000042;
+        background: #15223850;
         z: 40;
         TouchArea { clicked => { focus-sink.focus(); } }
         MessagePanel {
             x: (parent.width - self.width) / 2;
             y: (parent.height - self.height) / 2;
-            width: 520px;
-            height: 330px;
+            width: min(592px, parent.width - 32px);
+            height: min(400px, parent.height - 24px);
             items: root.announcements;
             unread-count: root.announcement-unread; total: root.announcement-total;
             loading: root.announcement-loading; failed: root.announcement-failed; loaded: root.announcement-loaded;
@@ -1492,12 +1503,14 @@ export component MainWindow inherits Window {
             delete-failed: root.announcement-delete-failed;
             connected: root.signal-connected;
             selected-id: root.announcement-selected-id; selected-title: root.announcement-selected-title;
+            selected-revision: root.announcement-selected-revision;
             selected-body: root.announcement-selected-body; selected-date: root.announcement-selected-date;
             selected-read: root.announcement-selected-read;
             open-message(id, revision) => { root.open-announcement(id, revision); }
             open-link(url) => { root.open-announcement-link(url); }
             delete-message(id, revision) => { root.delete-announcement(id, revision); }
             load-more => { root.load-more-announcements(); }
+            read-all => { root.read-all-announcements(); }
             close => { root.messages-open = false; }
         }
     }
@@ -1941,113 +1954,107 @@ export component MainWindow inherits Window {
     }
 
     if root.about-open: Rectangle {
-        background: transparent;
+        background: #15223850;
         z: 46;
         TouchArea { clicked => { focus-sink.focus(); } }
-        DialogSurface {
+        SettingsDialog {
             x: (parent.width - self.width) / 2;
             y: (parent.height - self.height) / 2;
-            width: 320px;
-            height: max(216px, about-content.preferred-height);
-            border-radius: UiRadius.surface;
+            width: min(400px, parent.width - 40px);
+            height: self.content-top + about-content.preferred-height + 24px;
+            title: UiStrings.about;
+            close-label: MessageStrings.close;
+            close => { root.about-open = false; }
 
-            Rectangle {
-                x: 0px;
-                y: 0px;
-                width: parent.width;
-                height: 21px;
-                background: #d3d3d3;
-                border-top-left-radius: UiRadius.surface;
-                border-top-right-radius: UiRadius.surface;
-                z: 5;
-                Text { x: 6px; text: UiStrings.about; font-size: ImGuiFontStyle.base; font-weight: 600; color: #202124; vertical-alignment: center; }
-            }
-            // Grow for update actions and wrapped translations while keeping
-            // the footer below the version and check result.
+            // Content-driven height keeps translated update states and actions
+            // above the footer without reserving an empty update section.
             about-content := VerticalLayout {
-                padding: 16px;
-                padding-top: 35px;
-                spacing: 12px;
-                alignment: space-between;
-
-                VerticalLayout {
-                    vertical-stretch: 0;
-                    spacing: 4px;
-                    Text {
-                        text: "CrossDesk " + root.current-version;
-                        color: #202124;
-                        font-size: ImGuiFontStyle.base;
-                        font-weight: 600;
-                        min-height: 18px;
-                        overflow: elide;
+                x: 24px; y: parent.content-top; width: parent.width - 48px;
+                height: self.preferred-height;
+                padding: 0px; spacing: 20px;
+                Rectangle {
+                    height: max(96px, product-info.preferred-height + 32px);
+                    background: WorkbenchStyle.surface;
+                    border-radius: UiRadius.surface;
+                    border-width: 1px; border-color: WorkbenchStyle.border;
+                    Image {
+                        x: 16px; y: (parent.height - self.height) / 2;
+                        width: 56px; height: 56px;
+                        source: @image-url("../../../resources/linux/crossdesk_128x128.png");
+                        image-fit: contain;
                     }
-                    if root.update-available: Rectangle {
-                        height: max(18px, version-link.preferred-height);
-                        accessible-role: button;
-                        accessible-label: UiStrings.release-notes + " " + root.latest-version;
-                        accessible-action-default => { version-touch.clicked(); }
-                        version-link := Text {
-                            x: 0px;
-                            y: 0px;
-                            width: parent.width;
-                            height: parent.height;
-                            text: UiStrings.update-available + ": " + root.latest-version;
-                            color: version-touch.has-hover ? #174ea6 : #334fd1;
-                            font-size: ImGuiFontStyle.body;
-                            vertical-alignment: center;
-                            horizontal-alignment: left;
-                            wrap: word-wrap;
-                        }
-                        version-touch := TouchArea {
-                            mouse-cursor: pointer;
-                            clicked => { root.about-open = false; root.update-open = true; }
+                    product-info := VerticalLayout {
+                        x: 88px; y: 16px; width: parent.width - 104px; height: parent.height - 32px;
+                        alignment: center; spacing: 5px;
+                        Text { text: "CrossDesk"; font-size: 22px; font-weight: 600; color: WorkbenchStyle.text; }
+                        Text {
+                            text: UiStrings.version + " " + root.current-version;
+                            color: WorkbenchStyle.muted; font-size: 12px; wrap: word-wrap;
                         }
                     }
-                    if root.update-available: HorizontalLayout {
-                        alignment: start;
-                        padding-top: 4px;
-                        CompactButton {
-                            width: max(76px, release-notes-button-metrics.preferred-width + 20px);
-                            text: UiStrings.view-release-notes;
+                }
+                if root.update-available || root.update-status-text != "": Rectangle {
+                    height: update-summary.preferred-height + 24px;
+                    background: root.update-check-status == UpdateCheckStatus.failed ? #fef2f2 : WorkbenchStyle.field-surface;
+                    border-radius: UiRadius.control;
+                    border-width: 1px;
+                    border-color: root.update-check-status == UpdateCheckStatus.failed ? #f3d4d1 : WorkbenchStyle.separator;
+                    update-summary := VerticalLayout {
+                        x: 12px; y: 12px; width: parent.width - 24px;
+                        height: self.preferred-height;
+                        padding: 0px; spacing: 10px;
+                        if root.update-available: Rectangle {
+                            height: version-link.preferred-height;
                             accessible-role: button;
-                            accessible-label: self.text;
-                            accessible-action-default => { self.clicked(); }
-                            clicked => { root.about-open = false; root.update-open = true; }
-                            release-notes-button-metrics := Text { visible: false; text: UiStrings.view-release-notes; font-size: ImGuiFontStyle.body; }
+                            accessible-label: UiStrings.release-notes + " " + root.latest-version;
+                            accessible-action-default => { version-touch.clicked(); }
+                            version-link := Text {
+                                width: parent.width;
+                                text: UiStrings.update-available + ": " + root.latest-version;
+                                color: version-touch.has-hover ? #254cc0 : WorkbenchStyle.accent;
+                                font-size: 13px; font-weight: 500; wrap: word-wrap;
+                            }
+                            version-touch := TouchArea {
+                                mouse-cursor: pointer;
+                                clicked => { root.about-open = false; root.update-open = true; }
+                            }
+                        }
+                        if root.update-status-text != "": Text {
+                            text: root.update-status-text;
+                            color: root.update-check-status == UpdateCheckStatus.failed ? #b3261e
+                                : root.update-check-status == UpdateCheckStatus.up-to-date ? WorkbenchStyle.success : WorkbenchStyle.muted;
+                            font-size: 12px; wrap: word-wrap;
+                        }
+                        if root.update-available: HorizontalLayout {
+                            alignment: start;
+                            SettingsButton {
+                                width: max(116px, release-notes-button-metrics.preferred-width + 24px);
+                                text: UiStrings.view-release-notes;
+                                clicked => { root.about-open = false; root.update-open = true; }
+                                release-notes-button-metrics := Text { visible: false; text: UiStrings.view-release-notes; font-size: 12px; }
+                            }
                         }
                     }
-                    if root.update-status-text != "": Text {
-                        text: root.update-status-text;
-                        color: root.update-check-status == UpdateCheckStatus.failed ? #b3261e : #61656c;
-                        font-size: ImGuiFontStyle.body;
-                        min-height: 18px;
-                        wrap: word-wrap;
-                    }
                 }
-
                 VerticalLayout {
-                    vertical-stretch: 0;
-                    spacing: 3px;
-                    Rectangle { height: 1px; background: #e6e8eb; }
-                    Text { height: 16px; text: UiStrings.copyright; color: #61656c; font-size: ImGuiFontStyle.body; vertical-alignment: center; }
-                    Text { height: 16px; text: UiStrings.license; color: #61656c; font-size: ImGuiFontStyle.body; vertical-alignment: center; }
+                    spacing: 5px;
+                    Text { text: UiStrings.copyright; color: WorkbenchStyle.muted; font-size: 11px; wrap: word-wrap; }
+                    Text { text: UiStrings.license; color: WorkbenchStyle.muted; font-size: 11px; wrap: word-wrap; }
                 }
-
-                HorizontalLayout {
-                    vertical-stretch: 0;
-                    alignment: end;
-                    spacing: 8px;
-                    CompactButton {
-                        width: max(76px, check-button-metrics.preferred-width + 20px);
-                        text: UiStrings.check-for-updates;
-                        enabled: root.update-check-status != UpdateCheckStatus.checking;
-                        accessible-role: button;
-                        accessible-label: self.text;
-                        accessible-action-default => { if self.enabled { root.check-for-updates(); } }
-                        clicked => { root.check-for-updates(); }
-                        check-button-metrics := Text { visible: false; text: UiStrings.check-for-updates; font-size: ImGuiFontStyle.body; }
+                VerticalLayout {
+                    spacing: 16px;
+                    Rectangle { height: 1px; background: WorkbenchStyle.separator; }
+                    HorizontalLayout {
+                        alignment: end; spacing: 8px;
+                        SettingsButton {
+                            width: max(116px, check-button-metrics.preferred-width + 24px);
+                            text: UiStrings.check-for-updates;
+                            enabled: root.update-check-status != UpdateCheckStatus.checking;
+                            clicked => { root.check-for-updates(); }
+                            check-button-metrics := Text { visible: false; text: UiStrings.check-for-updates; font-size: 12px; }
+                        }
+                        SettingsButton { width: 80px; primary: true; text: UiStrings.ok; clicked => { root.about-open = false; } }
                     }
-                    CompactButton { width: 48px; primary: true; text: UiStrings.ok; clicked => { root.about-open = false; } }
                 }
             }
         }
@@ -2151,6 +2158,8 @@ export component MainWindow inherits Window {
                                         text: block.content;
                                         default-color: WorkbenchStyle.text;
                                         default-font-size: 13px;
+                                        // Match the 1.5em line height of message bodies.
+                                        default-font-family: "CrossDesk Message Spacing";
                                     }
                                 }
                             }
diff --git a/apps/desktop/src/gui/ui/message_panel.slint b/apps/desktop/src/gui/ui/message_panel.slint
index 4713dbcb..59c44685 100644
--- a/apps/desktop/src/gui/ui/message_panel.slint
+++ b/apps/desktop/src/gui/ui/message_panel.slint
@@ -1,6 +1,9 @@
 import { UiRadius } from "ui_radius.slint";
 import { ScrollView } from "std-widgets.slint";
-import { CompactButton, DialogSurface, IconButton, FontAwesomeIcons, ImGuiFontStyle } from "common.slint";
+import { IconButton, FontAwesomeIcons } from "common.slint";
+import { SettingsDialog, SettingsButton } from "settings_controls.slint";
+import { WorkbenchStyle } from "workbench_controls.slint";
+import "../assets/fonts/message_spacing.ttf";
 
 export struct AnnouncementItem {
     id: string,
@@ -14,10 +17,11 @@ export global MessageStrings {
     in-out property <string> messages: "Messages";
     in-out property <string> unread: "Unread";
     in-out property <string> read: "Read";
+    in-out property <string> read-all: "Mark all as read";
     in-out property <string> empty: "No announcements";
     in-out property <string> select-message: "Select an announcement to read";
     in-out property <string> loading: "Loading…";
-    in-out property <string> read-save-error: "Unable to save reading status locally. Open the announcement again to retry.";
+    in-out property <string> read-save-error: "Unable to save reading status locally. Please try again.";
     in-out property <string> close: "Close";
     in-out property <string> delete-message: "Delete";
     in-out property <string> delete-title: "Delete announcement";
@@ -26,7 +30,7 @@ export global MessageStrings {
     in-out property <string> cancel: "Cancel";
 }
 
-export component MessagePanel inherits DialogSurface {
+export component MessagePanel inherits SettingsDialog {
     in property <[AnnouncementItem]> items;
     in property <int> unread-count;
     in property <int> total;
@@ -37,6 +41,7 @@ export component MessagePanel inherits DialogSurface {
     in property <bool> loaded;
     in property <bool> connected;
     in property <string> selected-id;
+    in property <string> selected-revision;
     in property <string> selected-title;
     in property <styled-text> selected-body;
     in property <string> selected-date;
@@ -45,11 +50,9 @@ export component MessagePanel inherits DialogSurface {
     callback open-link(string);
     callback delete-message(string, string);
     callback load-more;
-    callback close;
+    callback read-all;
     private property <string> notice-text: root.delete-failed ? MessageStrings.delete-error
         : root.read-save-failed ? MessageStrings.read-save-error : "";
-    private property <length> content-top: title-bar.height + (root.notice-text == "" ? 14px : 50px);
-    private property <color> separator-color: #e6e8eb;
     private property <string> pending-delete-id;
     private property <string> pending-delete-revision;
     function request-delete(id: string, revision: string) {
@@ -68,136 +71,151 @@ export component MessagePanel inherits DialogSurface {
             return reject;
         }
     }
-    background: white;
-    border-radius: UiRadius.surface;
-    TouchArea { }
-    title-bar := Rectangle {
-        x: 0px; y: 0px; width: parent.width; height: 21px;
-        background: #d3d3d3; border-top-left-radius: UiRadius.surface; border-top-right-radius: UiRadius.surface;
-        message-heading := Text {
-            x: 6px; width: parent.width - 100px; height: parent.height;
-            text: MessageStrings.messages;
-            font-size: ImGuiFontStyle.base; font-weight: 600; color: #202124;
-            vertical-alignment: center; overflow: elide;
-        }
-        if root.unread-count > 0: Rectangle {
-            x: message-heading.x + message-heading.preferred-width + 8px;
-            y: (parent.height - self.height) / 2; height: 16px;
-            width: max(16px, unread-count-label.preferred-width + 8px);
-            border-radius: 8px; background: #eaf2ff;
-            accessible-role: text;
-            accessible-label: MessageStrings.unread + " " + root.unread-count;
-            unread-count-label := Text {
-                text: "" + root.unread-count; color: #2563eb;
-                font-size: ImGuiFontStyle.small; font-weight: 600;
-                horizontal-alignment: center; vertical-alignment: center;
-                accessible-role: none;
-            }
-        }
-        if root.loading: Text {
-            x: parent.width - 150px; width: 110px; height: parent.height;
-            text: MessageStrings.loading; color: #61656c; font-size: ImGuiFontStyle.small;
-            horizontal-alignment: right; vertical-alignment: center;
-        }
-        IconButton {
-            x: parent.width - 25px; y: 2px; width: 19px; height: parent.height - 4px;
-            border-radius: UiRadius.control;
-            icon: FontAwesomeIcons.xmark; icon-size: ImGuiFontStyle.base;
-            icon-color: #202124;
-            hover-background: #bfc2c7; pressed-background: #b2b2b2;
-            accessible-role: button;
-            accessible-label: MessageStrings.close;
-            accessible-action-default => { root.close(); }
-            clicked => { root.close(); }
+    title: MessageStrings.messages;
+    close-label: MessageStrings.close;
+    badge-count: root.unread-count;
+    badge-label: MessageStrings.unread + " " + root.unread-count;
+    header-status: root.loading ? MessageStrings.loading : "";
+    action-text: MessageStrings.read-all;
+    action-enabled: root.loaded && !root.loading && root.unread-count > 0;
+    action => { root.read-all(); }
+    notice := Rectangle {
+        x: 24px; y: root.content-top; width: parent.width - 48px;
+        height: root.notice-text == "" ? 0px : notice-label.preferred-height + 20px;
+        visible: root.notice-text != "";
+        border-radius: UiRadius.control; background: #fef2f2;
+        notice-label := Text {
+            x: 10px; y: 10px; width: parent.width - 20px;
+            height: self.preferred-height;
+            text: root.notice-text; font-size: 12px; wrap: word-wrap; color: #b3261e;
         }
     }
-    if root.notice-text != "": Rectangle {
-        x: 16px; y: title-bar.height + 10px; width: parent.width - 32px; height: 28px;
-        border-radius: UiRadius.surface;
-        background: #fef2f2;
-        Text {
-            x: 8px; width: parent.width - 16px; height: parent.height;
-            text: root.notice-text; font-size: ImGuiFontStyle.body; overflow: elide;
-            color: #b3261e;
-            vertical-alignment: center;
+    message-content := Rectangle {
+        x: 24px; y: root.content-top + (root.notice-text == "" ? 0px : notice.height + 12px);
+        width: parent.width - 48px; height: parent.height - self.y - 24px;
+        background: WorkbenchStyle.surface;
+        border-radius: UiRadius.surface; border-width: 1px; border-color: WorkbenchStyle.border;
+        if root.items.length > 0 || root.selected-id != "": Rectangle {
+            x: 1px; y: 1px; width: content-divider.x - 1px; height: parent.height - 2px;
+            background: WorkbenchStyle.field-surface;
+            border-top-left-radius: UiRadius.surface - 1px;
+            border-bottom-left-radius: UiRadius.surface - 1px;
         }
-    }
-    announcement-list := Rectangle {
-        x: 16px; y: root.content-top; width: 168px; height: parent.height - self.y - 16px;
-        announcements-scroll := ScrollView {
-            width: parent.width; height: parent.height;
-            VerticalLayout {
-                width: announcements-scroll.width; spacing: 0px; padding: 0px;
-                padding-right: 8px;
-                alignment: start;
-                for item[index] in root.items: Rectangle {
-                    height: 54px;
-                    background: root.selected-id == item.id ? #eaf2ff : entry-touch.has-hover ? #f0f1f2 : transparent;
-                    border-radius: UiRadius.control;
-                    Text { x: 8px; y: 6px; width: parent.width - 32px; height: 18px; text: item.title; overflow: elide; font-size: ImGuiFontStyle.base; font-weight: item.read ? 400 : 600; color: #202124; vertical-alignment: center; }
-                    if !item.read: Rectangle {
-                        x: parent.width - 17px; y: 13px; width: 5px; height: 5px;
-                        border-radius: 2.5px; background: #2563eb;
-                        accessible-role: none;
-                    }
-                    Text { x: 8px; y: 28px; width: parent.width - 36px; height: 16px; text: item.date; color: #61656c; font-size: ImGuiFontStyle.small; overflow: elide; vertical-alignment: center; }
-                    accessible-role: button;
-                    accessible-label: item.title + " " + (item.read ? MessageStrings.read : MessageStrings.unread);
-                    accessible-action-default => { root.open-message(item.id, item.revision); }
-                    entry-touch := TouchArea { mouse-cursor: pointer; clicked => { root.open-message(item.id, item.revision); } }
-                    IconButton {
-                        x: parent.width - 24px; y: 26px; width: 20px; height: 20px;
-                        icon: FontAwesomeIcons.xmark; icon-size: ImGuiFontStyle.small;
-                        icon-color: #61656c; danger: true;
+        announcement-list := Rectangle {
+            x: 8px; y: 8px; width: 176px; height: parent.height - 16px;
+            announcements-scroll := ScrollView {
+                width: parent.width; height: parent.height;
+                viewport-width: self.width - 10px;
+                viewport-height: announcement-entries.preferred-height;
+                horizontal-scrollbar-policy: always-off;
+                vertical-scrollbar-policy: as-needed;
+                announcement-entries := VerticalLayout {
+                    width: announcements-scroll.viewport-width; spacing: 10px; padding: 0px;
+                    alignment: start;
+                    for item in root.items: Rectangle {
+                        height: 64px;
+                        background: root.selected-id == item.id ? #e8efff
+                            : entry-touch.pressed ? WorkbenchStyle.pressed-surface
+                            : entry-touch.has-hover ? WorkbenchStyle.hover-surface : WorkbenchStyle.surface;
+                        border-radius: UiRadius.control;
+                        border-width: 1px;
+                        border-color: root.selected-id == item.id ? #b5c9f5 : WorkbenchStyle.border;
+                        Text {
+                            x: 10px; y: 9px; width: parent.width - 30px; height: 20px;
+                            text: item.title; overflow: elide; font-size: 13px;
+                            font-weight: item.read ? 400 : 600;
+                            color: root.selected-id == item.id ? WorkbenchStyle.accent : WorkbenchStyle.text;
+                            vertical-alignment: center;
+                        }
+                        if !item.read: Rectangle {
+                            x: parent.width - 15px; y: 16px; width: 6px; height: 6px;
+                            border-radius: 3px; background: WorkbenchStyle.accent;
+                            accessible-role: none;
+                        }
+                        Text {
+                            x: 10px; y: 35px; width: parent.width - 20px; height: 18px;
+                            text: item.date; color: WorkbenchStyle.muted; font-size: 11px;
+                            overflow: elide; vertical-alignment: center;
+                        }
                         accessible-role: button;
-                        accessible-label: MessageStrings.delete-message + " " + item.title;
-                        accessible-action-default => { root.request-delete(item.id, item.revision); }
-                        clicked => { root.request-delete(item.id, item.revision); }
-                    }
-                    if index < root.items.length - 1: Rectangle {
-                        x: 8px; y: parent.height - 1px;
-                        width: parent.width - 16px; height: 1px;
-                        background: root.separator-color;
-                        accessible-role: none;
+                        accessible-label: item.title + " " + (item.read ? MessageStrings.read : MessageStrings.unread);
+                        accessible-action-default => { root.open-message(item.id, item.revision); }
+                        entry-touch := TouchArea {
+                            mouse-cursor: pointer;
+                            clicked => { root.open-message(item.id, item.revision); }
+                        }
                     }
                 }
             }
         }
-    }
-    if root.items.length == 0 && root.total == 0 && root.loaded && root.connected && !root.loading && !root.failed: Text {
-        x: 16px; y: root.content-top; width: parent.width - 32px; height: announcement-list.height;
-        text: MessageStrings.empty; wrap: word-wrap;
-        color: #61656c; font-size: ImGuiFontStyle.body;
-        horizontal-alignment: center; vertical-alignment: center;
-    }
-    content-divider := Rectangle {
-        x: announcement-list.x + announcement-list.width + 12px;
-        y: root.content-top; width: 1px; height: announcement-list.height;
-        background: root.separator-color;
-        visible: root.items.length > 0 || root.selected-id != "";
-        accessible-role: none;
-    }
-    announcement-details := Rectangle {
-        x: content-divider.x + content-divider.width + 12px;
-        y: root.content-top; width: parent.width - self.x - 16px; height: announcement-list.height;
-        if root.selected-id == "" && root.items.length > 0: Text { x: 8px; width: parent.width - 16px; text: MessageStrings.select-message; color: #61656c; font-size: ImGuiFontStyle.body; wrap: word-wrap; horizontal-alignment: center; vertical-alignment: center; }
-        if root.selected-id != "": details-scroll := ScrollView {
-            width: parent.width; height: parent.height;
-            VerticalLayout {
-                width: details-scroll.width; padding: 8px; padding-top: 6px; padding-right: 16px;
-                spacing: 12px; alignment: start;
-                VerticalLayout {
-                    vertical-stretch: 0; spacing: 4px;
-                    Text { vertical-stretch: 0; min-height: 18px; text: root.selected-title; wrap: word-wrap; font-size: ImGuiFontStyle.base; font-weight: 600; color: #202124; vertical-alignment: center; }
-                    Text { vertical-stretch: 0; min-height: 16px; text: root.selected-date; accessible-label: root.selected-date + " · " + (root.selected-read ? MessageStrings.read : MessageStrings.unread); color: #61656c; font-size: ImGuiFontStyle.small; wrap: word-wrap; vertical-alignment: center; }
-                }
-                Rectangle { height: 1px; background: root.separator-color; }
-                StyledText {
-                    vertical-stretch: 0;
-                    text: root.selected-body;
-                    default-color: #202124; default-font-size: ImGuiFontStyle.body;
-                    link-color: #2563eb;
-                    link-clicked(url) => { root.open-link(url); }
+        if root.items.length == 0 && root.total == 0 && root.loaded && root.connected && !root.loading && !root.failed: Text {
+            x: 24px; width: parent.width - 48px; height: parent.height;
+            text: MessageStrings.empty; wrap: word-wrap;
+            color: WorkbenchStyle.muted; font-size: 13px;
+            horizontal-alignment: center; vertical-alignment: center;
+        }
+        content-divider := Rectangle {
+            x: announcement-list.x + announcement-list.width + 8px;
+            y: 1px; width: 1px; height: parent.height - 2px;
+            background: WorkbenchStyle.separator;
+            visible: root.items.length > 0 || root.selected-id != "";
+            accessible-role: none;
+        }
+        announcement-details := Rectangle {
+            x: content-divider.x + 17px; y: 16px;
+            width: parent.width - self.x - 16px; height: parent.height - 32px;
+            clip: true;
+            if root.selected-id == "" && root.items.length > 0: Text {
+                width: parent.width; height: parent.height;
+                text: MessageStrings.select-message; color: WorkbenchStyle.muted; font-size: 13px;
+                wrap: word-wrap; horizontal-alignment: center; vertical-alignment: center;
+            }
+            if root.selected-id != "": details-scroll := ScrollView {
+                width: parent.width; height: parent.height;
+                viewport-width: self.width - 12px;
+                viewport-height: details-content.preferred-height;
+                horizontal-scrollbar-policy: always-off;
+                vertical-scrollbar-policy: as-needed;
+                details-content := VerticalLayout {
+                    width: details-scroll.viewport-width; padding: 0px; padding-bottom: 4px;
+                    spacing: 14px; alignment: start;
+                    Rectangle {
+                        height: max(28px, selected-heading.preferred-height);
+                        selected-heading := VerticalLayout {
+                            x: 0px; y: 0px;
+                            width: parent.width - 40px; height: self.preferred-height;
+                            padding: 0px; spacing: 6px;
+                            Text {
+                                vertical-stretch: 0; text: root.selected-title; wrap: word-wrap;
+                                font-size: 16px; font-weight: 600; color: WorkbenchStyle.text;
+                            }
+                            Text {
+                                vertical-stretch: 0; text: root.selected-date;
+                                accessible-label: root.selected-date + " · " + (root.selected-read ? MessageStrings.read : MessageStrings.unread);
+                                color: WorkbenchStyle.muted; font-size: 11px; wrap: word-wrap;
+                            }
+                        }
+                        IconButton {
+                            x: parent.width - self.width; y: 0px; width: 28px; height: 28px;
+                            icon: FontAwesomeIcons.trash-can; icon-size: 12px;
+                            icon-color: WorkbenchStyle.muted; danger: true;
+                            accessible-role: button;
+                            accessible-label: MessageStrings.delete-message + " " + root.selected-title;
+                            accessible-action-default => { root.request-delete(root.selected-id, root.selected-revision); }
+                            clicked => { root.request-delete(root.selected-id, root.selected-revision); }
+                        }
+                    }
+                    Rectangle { height: 1px; background: WorkbenchStyle.separator; }
+                    StyledText {
+                        vertical-stretch: 0;
+                        text: root.selected-body;
+                        default-color: WorkbenchStyle.text; default-font-size: 13px;
+                        // Metrics-only family provides 1.5em line height; visible
+                        // glyphs continue to use Slint's normal font fallback.
+                        default-font-family: "CrossDesk Message Spacing";
+                        link-color: WorkbenchStyle.accent;
+                        link-clicked(url) => { root.open-link(url); }
+                    }
                 }
             }
         }
@@ -211,30 +229,31 @@ export component MessagePanel inherits DialogSurface {
         triggered => { root.load-more(); }
     }
     if root.pending-delete-id != "": Rectangle {
-        background: #00000042; border-radius: root.border-radius; z: 30;
+        background: #15223850; border-radius: root.border-radius; z: 30;
         TouchArea { clicked => { confirmation-keys.focus(); } }
-        DialogSurface {
+        SettingsDialog {
             x: (parent.width - self.width) / 2;
             y: (parent.height - self.height) / 2;
-            width: 230px; height: confirmation-content.preferred-height;
-            border-radius: root.border-radius;
-            TouchArea { clicked => { confirmation-keys.focus(); } }
+            width: min(360px, root.width - 48px);
+            height: self.content-top + confirmation-content.preferred-height + 24px;
+            title: MessageStrings.delete-title;
+            close-label: MessageStrings.cancel;
+            close => { root.pending-delete-id = ""; }
             confirmation-content := VerticalLayout {
-                padding: 16px;
-                padding-top: 26px;
-                padding-bottom: 26px;
-                spacing: 20px;
-                Text { text: MessageStrings.delete-confirmation; font-size: ImGuiFontStyle.base; color: #202124; wrap: word-wrap; horizontal-alignment: center; }
+                x: 24px; y: parent.content-top; width: parent.width - 48px;
+                height: self.preferred-height;
+                padding: 0px; spacing: 24px;
+                Text { text: MessageStrings.delete-confirmation; font-size: 13px; color: WorkbenchStyle.text; wrap: word-wrap; }
                 HorizontalLayout {
-                    alignment: center; spacing: 8px;
-                    cancel-delete-button := CompactButton {
-                        width: 72px; text: MessageStrings.cancel;
+                    alignment: end; spacing: 8px;
+                    cancel-delete-button := SettingsButton {
+                        width: 88px; text: MessageStrings.cancel;
                         accessible-role: button; accessible-label: MessageStrings.cancel;
                         accessible-action-default => { cancel-delete-button.clicked(); }
                         clicked => { root.pending-delete-id = ""; }
                     }
-                    confirm-delete-button := CompactButton {
-                        width: 72px; text: MessageStrings.delete-message; primary: true;
+                    confirm-delete-button := SettingsButton {
+                        width: 88px; text: MessageStrings.delete-message; primary: true;
                         accessible-role: button; accessible-label: MessageStrings.delete-title;
                         accessible-action-default => { confirm-delete-button.clicked(); }
                         clicked => {
diff --git a/apps/desktop/src/gui/ui/settings_controls.slint b/apps/desktop/src/gui/ui/settings_controls.slint
index 5deab0e2..1399ceaa 100644
--- a/apps/desktop/src/gui/ui/settings_controls.slint
+++ b/apps/desktop/src/gui/ui/settings_controls.slint
@@ -1,5 +1,5 @@
 import { UiRadius } from "ui_radius.slint";
-import { CompactComboBox, ToggleSwitch } from "common.slint";
+import { CompactComboBox, ToggleSwitch, DialogSurface, IconButton, FontAwesomeIcons } from "common.slint";
 import { WorkbenchStyle } from "workbench_controls.slint";
 
 // Shared visual treatment for the global settings pages.
@@ -28,6 +28,66 @@ export component SettingsButton inherits Rectangle {
     touch := TouchArea { enabled: root.enabled; mouse-cursor: pointer; clicked => { root.clicked(); } }
 }
 
+export component SettingsDialog inherits DialogSurface {
+    in property <string> title;
+    in property <string> close-label;
+    in property <int> badge-count: 0;
+    in property <string> badge-label;
+    in property <string> header-status;
+    in property <string> action-text;
+    in property <bool> action-enabled: true;
+    out property <length> content-top: 64px;
+    callback action();
+    callback close();
+    background: #f8fafc;
+    border-color: WorkbenchStyle.separator;
+    drop-shadow-color: #14294424;
+    drop-shadow-blur: 24px;
+    drop-shadow-offset-y: 8px;
+    TouchArea { }
+    HorizontalLayout {
+        x: 24px; y: 18px; width: parent.width - 48px; height: 28px;
+        spacing: 10px;
+        Text {
+            text: root.title; font-size: 20px; font-weight: 600;
+            color: WorkbenchStyle.text; vertical-alignment: center;
+        }
+        if root.badge-count > 0: Rectangle {
+            width: max(24px, count-label.preferred-width + 14px); height: 22px;
+            border-radius: 11px; background: #e8efff;
+            accessible-role: text; accessible-label: root.badge-label;
+            count-label := Text {
+                text: "" + root.badge-count; color: WorkbenchStyle.accent;
+                font-size: 11px; font-weight: 600;
+                horizontal-alignment: center; vertical-alignment: center;
+                accessible-role: none;
+            }
+        }
+        Rectangle { horizontal-stretch: 1; }
+        if root.header-status != "": Text {
+            text: root.header-status; color: WorkbenchStyle.muted;
+            font-size: 11px; vertical-alignment: center;
+        }
+        if root.action-text != "": SettingsButton {
+            width: action-label-metrics.preferred-width + 24px; height: 28px;
+            text: root.action-text; enabled: root.action-enabled;
+            clicked => { root.action(); }
+            action-label-metrics := Text { visible: false; text: root.action-text; font-size: 12px; }
+        }
+        IconButton {
+            width: 28px; height: 28px;
+            icon: FontAwesomeIcons.xmark; icon-size: 14px;
+            icon-color: WorkbenchStyle.muted;
+            hover-background: WorkbenchStyle.hover-surface;
+            pressed-background: WorkbenchStyle.pressed-surface;
+            accessible-role: button; accessible-label: root.close-label;
+            accessible-action-default => { root.close(); }
+            clicked => { root.close(); }
+        }
+    }
+    @children
+}
+
 export component SettingsSelect inherits CompactComboBox {
     subtle: true;
     show-arrow: false;
diff --git a/apps/desktop/src/gui/ui/ui_localization.h b/apps/desktop/src/gui/ui/ui_localization.h
index 76d0cfed..59a6e29a 100644
--- a/apps/desktop/src/gui/ui/ui_localization.h
+++ b/apps/desktop/src/gui/ui/ui_localization.h
@@ -46,6 +46,7 @@ inline int ApplyMainWindowStrings(
   messages.set_messages(Text(localization::messages[language]));
   messages.set_unread(Text(localization::message_unread[language]));
   messages.set_read(Text(localization::message_read[language]));
+  messages.set_read_all(Text(localization::message_read_all[language]));
   messages.set_empty(Text(localization::message_empty[language]));
   messages.set_select_message(Text(localization::message_select[language]));
   messages.set_loading(Text(localization::message_loading[language]));