[ui] unify settings dialogs and improve announcement controls

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()