fix(launcher): larger, ring-bordered preset chips for VNC readability; fix lint errors

Bumps chip buttons h-6→h-8 with text-xs and ring-1 borders so active/inactive
states are clearly distinct at VNC/remote scale. Save & Apply bumped to h-10
text-sm. Fixes: /50 opacity modifier in class: directives (uses class expression
instead), stale svelte-ignore comments replaced with onkeydown handlers, each
block key added. Documents wallpaper repeat-apply macOS caching bug in TODO with
workaround and fix location (Electron temp filename).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

documentation/TODO__Agents.md

@@ -63,6 +63,16 @@ guessing defaults.
 - [ ] **[Launcher] End-to-end test on macOS** — test pptx and key opens on a real podium Mac
   before May 26 setup day. Verify: file copies to tmp correctly, script fires, app opens in
   slideshow mode, error fallback works.
+- [ ] **[Launcher/Electron] Wallpaper stops applying after several changes (post-CMSC)** —
+  After setting the wallpaper 3–5 times in a session, macOS silently ignores further `set desktop
+  picture` calls even though the SvelteKit side reports "Saved & Applied ✓". Restore Default
+  (`restore_macos_default_wallpaper`) immediately unblocks it; closing/reopening Electron does
+  not. **Workaround:** use Restore Default, then re-apply. **Root cause:** macOS caches the
+  current wallpaper path and skips the AppleScript call when the downloaded file lands at the
+  same temp path. **Fix (post-CMSC):** in the Electron `set_wallpaper` handler
+  (`aether_app_native_electron`), append a timestamp or random suffix to the temp filename on
+  every download so macOS always sees a new path (e.g. `wallpaper_1748123456.jpg` instead of
+  `wallpaper.jpg`).
 
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