v0.3.5 — theme system, plugin platform, sectioned Settings, tab animations

- Themes: built-in presets (Ember/Forest/Ocean/Rosé) + custom-theme editor
  (per-token color pickers, live preview, JSON export/import). src/themes.ts.
- Plugin platform: JS/ESM plugins loaded via blob-module import (CSP
  script-src blob:), Host SDK with menu / file-context / view / submit-hook
  contribution points + permission model. Backend commands to list/read/enable/
  install/remove plugins under <config>/plugins/. Example plugin + PLUGINS.md.
- Settings redesigned into a sectioned hub (General / Appearance / Plugins);
  Themes and Plugins moved in, removed from the Actions menu.
- "NEW" badge on History commits submitted < 3h ago.
- Smooth tab transitions: sliding underline + content fade on Changes/History,
  and matching fades on the view-panel and dock tab groups.
- Fix: settings close button used the default browser style.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src-tauri/tauri.conf.json

@@ -2,7 +2,7 @@
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "Exbyte Depot",
   "mainBinaryName": "Exbyte Depot",
-  "version": "0.3.4",
+  "version": "0.3.5",
   "identifier": "com.bonchellon.exbyte-depot",
   "build": {
     "beforeDevCommand": "npm run dev",
@@ -24,8 +24,8 @@
       }
     ],
     "security": {
-      "csp": "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob: asset: http://asset.localhost; media-src 'self' blob:; font-src 'self' data:; connect-src 'self' ipc: http://ipc.localhost https://openrouter.ai; worker-src 'self' blob:; object-src 'none'; base-uri 'self'",
-      "devCsp": "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob: asset: http://asset.localhost; media-src 'self' blob:; font-src 'self' data:; connect-src 'self' ipc: http://ipc.localhost ws://localhost:1420 http://localhost:1420 https://openrouter.ai; worker-src 'self' blob:; object-src 'none'; base-uri 'self'"
+      "csp": "default-src 'self'; script-src 'self' blob:; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob: asset: http://asset.localhost; media-src 'self' blob:; font-src 'self' data:; connect-src 'self' ipc: http://ipc.localhost https://openrouter.ai; worker-src 'self' blob:; object-src 'none'; base-uri 'self'",
+      "devCsp": "default-src 'self'; script-src 'self' 'unsafe-inline' blob:; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob: asset: http://asset.localhost; media-src 'self' blob:; font-src 'self' data:; connect-src 'self' ipc: http://ipc.localhost ws://localhost:1420 http://localhost:1420 https://openrouter.ai; worker-src 'self' blob:; object-src 'none'; base-uri 'self'"
     }
   },
   "bundle": {