PR #78026: fix(control-ui): strip <think>/<final> tags from rendered assistant text

• Repository: openclaw/openclaw
• Author: Beandon13
• State: open | merged: False
• Link: https://github.com/openclaw/openclaw/pull/78026

Description (problem / solution / changelog)

Summary

• renderGroupedMessage reads message.content[].text directly via normalizeMessage, so the streaming bubble and any non-streaming history message can render raw <think> / <final> scaffolding the model emitted as text.
• Run the assembled assistant text through stripThinkingTags (internal-scaffolding profile, already used elsewhere in the chat extractor) before it becomes markdown. User and tool roles are unchanged.
• Adds two regression tests covering both renderStreamingGroup and the non-streaming renderMessageGroup path.

Closes #77879

Testing

• pnpm vitest run ui/src/ui/chat/grouped-render.test.ts (37/37, includes 2 new)
• pnpm vitest run ui/src/ui/chat (205/205)
• pnpm vitest run ui/src/ui/views/chat.test.ts (28/28)

Real behavior proof

• Behavior or issue addressed: Issue #77879 reports literal <think> and <final> tags appearing in openclaw-control-ui chat bubbles even when thinkingDefault is "off". The two new tests fail on origin/main (text content includes the tag bodies) and pass after this patch.
• Real environment tested: Local OpenClaw checkout from this PR branch on macOS (Darwin 25.5.0) at HEAD f25a2824ec81a022727559a6ad1a8e8633ccd77e. Vitest runs from the branch worktree against the changed UI module.
• Exact steps or command run after this patch:

  pnpm vitest run ui/src/ui/chat/grouped-render.test.ts
  pnpm vitest run ui/src/ui/chat

• Evidence after fix:

   Test Files  1 passed (1)
        Tests  37 passed (37)
     Start at  15:06:14
     Duration  1.11s
  
   Test Files  17 passed (17)
        Tests  205 passed (205)

• Observed result after fix: Streaming and non-streaming assistant bubbles render "Visible answer" / "Done." without the surrounding tags or the in-tag content; tool and user message rendering paths are untouched.
• What was not tested: A live multi-turn streaming session against google/gemini-flash-3 was not run; this is a UI-side render fix, and the hosted control-ui smoke is covered by CI.

Changed files

• ui/src/ui/chat/grouped-render.test.ts (modified, +38/-0)
• ui/src/ui/chat/grouped-render.ts (modified, +9/-1)