ui: version-display via JS, undo-toast centering, ctrl+enter save, test progress polish

* version: every span that shows v<APP_VERSION> in the page chrome now
  carries data-app-version, and checkAuth() patches them in from the
  /api/auth/status response so the GUI version doesn't go stale when
  PHP is cached behind anything that revalidates lazily.

* undo: tailwind v4 compiles `-translate-x-1/2` to the *new* CSS
  `translate` property, which then stacks with the inline `transform`
  the toast set — the box ended up shifted ~ -100% and looked left-
  anchored. Drop the tailwind utility, set `translate` directly inline
  so there's one source of truth for the offset.

* editor: ctrl/cmd+enter while the editor modal is open now invokes
  saveCard() (= save + close), pairing with the existing ctrl+s
  (save only) and ctrl+shift+s (save+close) shortcuts.

* collab buckets: drop the inset left edge from .bucket-tab-collab and
  the matching pulse-keyframe shadow — the bar tab now reads as a
  normal bucket tab, just with the unread dot + 3-cycle pulse on update.

* collab create dialog: drop the box border / background from
  .collab-toggle-row and .collab-members so the toggle and the user
  list sit directly on the modal background instead of looking like
  nested input boxes.

* test progress strip: ensureProgressBar() now also pushes the body
  down by 30px AND shrinks it via height: calc(100vh - 30px) so the
  fixed-top bar doesn't clip the footer (body is h-screen +
  overflow-hidden in the core layout). hideProgress() clears both
  inline styles when the run finishes.

chore: bump version to 0.9.2

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

public/js/modules/undo.js

@@ -66,21 +66,29 @@ export function pushBatch(label, patches) {
 }
 
 // Toast hint
+//
+// Centering note: tailwind v4 compiles `-translate-x-1/2` to the *new*
+// CSS `translate` property, which then stacks with any inline `transform`
+// we set — the box ended up shifted ~ -100% (utility translate + JS
+// transform translate both applied) and looked left-anchored. Fix: drop
+// the tailwind translate utility and centre purely via the modern
+// `translate` property in inline styles, which is one source of truth.
 let hintTimer = null;
 function showHint(text) {
     let el = document.getElementById('undo-hint');
     if (!el) {
         el = document.createElement('div');
         el.id = 'undo-hint';
-        el.className = 'fixed bottom-16 left-1/2 -translate-x-1/2 z-[95] bg-t-surface border border-t-border px-4 py-2 text-xs font-pixel text-t-muted shadow-lg transition-all';
+        el.className = 'fixed bottom-16 left-1/2 z-[95] bg-t-surface border border-t-border px-4 py-2 text-xs font-pixel text-t-muted shadow-lg transition-all';
+        el.style.translate = '-50% 0';
         document.body.appendChild(el);
     }
     el.textContent = text + '  (ctrl+z undo)';
     el.style.opacity = '1';
-    el.style.transform = 'translateX(-50%) translateY(0)';
+    el.style.translate = '-50% 0';
     clearTimeout(hintTimer);
     hintTimer = setTimeout(() => {
         el.style.opacity = '0';
-        el.style.transform = 'translateX(-50%) translateY(8px)';
+        el.style.translate = '-50% 8px';
     }, 2500);
 }