chore: update fonts, Tauri config, and reduced-motion support

- Switch font deps from Sora/Manrope/IBM Plex Mono to Fraunces/Inter/Space Mono (Cold Open theme)
- Add Tauri window permissions for custom titlebar controls
- Disable native decorations and drag-drop in Tauri config
- Add prefers-reduced-motion media query for WCAG compliance

src-tauri/capabilities/default.json

@@ -5,6 +5,14 @@
   "windows": ["main"],
   "permissions": [
     "core:default",
-    "dialog:default"
+    "dialog:default",
+    "core:window:allow-minimize",
+    "core:window:allow-toggle-maximize",
+    "core:window:allow-is-maximized",
+    "core:window:allow-close",
+    "core:window:allow-start-dragging",
+    "core:window:allow-set-size",
+    "core:window:allow-set-position",
+    "core:window:allow-set-always-on-top"
   ]
 }