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>

src/App.css

@@ -951,7 +951,8 @@ body.resizing-v{cursor:row-resize!important;user-select:none}
 .toast{position:fixed;bottom:18px;left:50%;transform:translateX(-50%);z-index:200;max-width:72%;
   background:var(--elevated);border:1px solid var(--border);color:var(--txt);
   padding:11px 18px;border-radius:12px;font-size:12.5px;box-shadow:0 20px 50px -15px rgba(0,0,0,.6);
-  animation:toastin .25s ease;white-space:pre-wrap;text-align:center}
+  animation:toastin .25s ease;white-space:pre-wrap;text-align:center;
+  max-height:30vh;overflow-y:auto;overflow-wrap:anywhere}
 .toast.err{border-color:rgba(242,99,126,.4);color:var(--del)}
 @keyframes toastin{from{opacity:0;transform:translate(-50%,10px)}to{opacity:1;transform:translate(-50%,0)}}