[6.x] Ask AI groundwork: card alignment, UiRenderer setValues(), AI problems, word diff

[riasvdv]

Summary

Generic pieces the Ask AI PR builds on, one commit each:

 craft-card
   .card__header__suffix
+    align-items: center        # badges line up with header actions

 UiRenderer (exposed)
   setValue(path, value, kind)
+  setValues([{path, value, refreshable}])
+    set all values
+    refresh the layout once, for the last refreshable change

 Ai::problems()
   for each task
-    no provider → problem
+    no provider → problem, only once a provider is chosen anywhere

+resources/js/common/utils/diff.ts
+  renderDiff(current, proposed, highlights, expanded) → {pieces, collapsed, edits}

The problems() change matters once Craft registers its own task: without it, every install would show a “can’t run yet” alert while AI is still off.

Evidence

• UiRenderer.test.ts › refreshes once after setting several refreshable values
  • Before: n/a (new API)
  • After: 1 refresh request with every value
• AiTest › lists the problems admins need to fix
  • Before: nothing chosen → Summarize doesn’t have a provider…
  • After: nothing chosen → no problem; another task has a provider → Summarize doesn’t have a provider…
• diff.test.ts covers word diffs, collapsing, and highlights.

[github-actions]

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