1.2.5: text font picker + 7 bundled Google fonts + default text fill black

- New src/lib/fonts.ts: curated set (Inter, Roboto, Lora, Playfair
  Display, Bebas Neue, Source Code Pro, Permanent Marker) shipped as
  local .woff2 in public/fonts/. loadFonts() registers them via
  FontFace at app start; fontsReady ref re-triggers Konva text configs
  once fonts resolve so the first paint isn't stuck on the fallback.
- TextAsset gets optional fontFamily (id; undefined = system sans).
  PropertiesPanel adds a font dropdown next to font size.
- All five render sites read the family: CanvasStage textConfig +
  clipTextConfig (Konva), drawLayer + drawMaskShape (canvas2d),
  exportPlayer engine (uses an embedded FONT_FAMILIES map and fontFam
  helper; runtime version 27 → 28).
- Example HTML export now lists used bundled fonts and prints the
  @font-face CSS the user has to paste alongside the .woff2 files —
  fonts themselves are NOT bundled into the export to keep it small.
- Default text fill changed from yellow #f5d76e to black #000000 in
  both the main sidebar and the SVG-scope add-text path.
- 8 new tests under "text font picker — model + render + export".

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "ruwio",
   "private": true,
-  "version": "1.2.4",
+  "version": "1.2.5",
   "type": "module",
   "scripts": {
     "dev": "vite",