Fix dead Unreal plugin actions, sync toast flood, Team Relay theming

- ue bridge: Launch / Build now read live refs. They captured startBuild /
  launchUE from the render where plugins loaded — before the async .uproject
  and .sln detection had resolved — so both saw empty paths forever. hasProject
  used the live ref, so the menu items showed up and then did nothing.
- Get Latest / Sync to revision: summarise `p4 sync` stdout (syncSummary)
  instead of dumping every depot path into the toast. flash() caps length and
  .toast caps height so no raw output can blow up the bubble again.
- Team Relay: use the real theme tokens — --txt / --add / --del, not
  --text / --ok / --err, which don't exist and silently fell back to a
  near-white hardcode, invisible on the light theme. Bumped to 1.0.1.
- Plugin dock panels get a status-bar button next to Terminal / Log; the tabs
  were otherwise only reachable from the Actions menu.
- PLUGINS.md documents the theme token names.

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

plugins-examples/team-relay/plugin.json

@@ -1,7 +1,7 @@
 {
   "id": "team-relay",
   "name": "Team Relay",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "author": "Exbyte Studios",
   "description": "See who on the team is online and what they have open, over a lightweight relay on your VPN. Coordinators (admin/super) can force-shelve a teammate's open work to the server when they've stepped away — the teammate's client does the shelve; nothing is submitted. Configure the relay URL in the Team tab. Requires the Exbyte relay service.",
   "entry": "index.js",