0.3.6 — plugin registry, Unreal extracted to a plugin, in-app update check + fixes

- Official plugin registry hosted on Gitea; client fetches registry.json over
  HTTPS and installs plugins via backend plugin_write_file.
- Auto-install autoInstall plugins on first connect; per-machine enabled state.
- Extract all Unreal tooling (Build Solution / Unreal Log) into a separate
  "unreal" plugin (defaultEnabled) driven through the new host.ue bridge;
  core UI no longer hard-wires Unreal.
- Settings → Plugins: "Official plugins" section with Install buttons.
- Status bar: "Updates" button (right of Log) triggers an update check without
  restarting the client.
- Fixes: NEW badge hard-right/centered without shifting text; History commit
  size no longer flickers (cached per change); giant icons in empty plugin/
  People lists; Get Latest hover contrast.

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

plugins-examples/unreal/plugin.json

@@ -0,0 +1,12 @@
+{
+  "id": "unreal",
+  "name": "Unreal Engine Tools",
+  "version": "1.0.0",
+  "author": "Exbyte Studios",
+  "description": "Build the game (.sln / UnrealBuildTool) and tail the Unreal editor log. Enable this on Unreal Engine projects.",
+  "entry": "index.js",
+  "minAppVersion": "0.3.6",
+  "permissions": ["ue"],
+  "defaultEnabled": true,
+  "contributes": { "menu": true, "views": ["unreal-log"] }
+}