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.md

@@ -75,6 +75,17 @@ host.t(key, params?)               // app i18n
 host.log(...args)                  // console, tagged with the plugin id
 ```
 
+## Theme tokens
+A plugin's DOM inherits the app's CSS variables — use them so the panel follows the
+active theme. The exact names (a wrong name silently falls back to your hardcoded
+default, which then breaks on the opposite theme):
+
+`--accent` `--accent-2` `--accent-deep` · `--bg` `--panel` `--panel-2` `--panel-3`
+`--elevated` `--border` · `--txt` `--muted` `--faint` · `--add` (success) `--edit`
+(warning) `--del` (danger) · `--mono` (font)
+
+There is no `--text`, `--ok`, `--err`, or `--sans`.
+
 ## Contribution points
 - **Menu items** and **views** appear in the **Actions** menu.
 - **File context items** appear when you right-click a file in Changes.