fix(planner): add clarification questions before plan generation

[zhanba]

Screen record

https://jam.dev/c/d13db240-0509-44b3-b547-faadbdcd4717

Summary

• Allow the planner agent to ask clarification questions via askFollowupQuestion tool before generating implementation plans
• Update planner workflow with clarification phase and ambiguity gate to ensure high-quality, decision-complete plans
• Ensure planner agent always runs in manual mode for user interaction
• Fix typo: askFollowupQuestions → askFollowupQuestion in prompts
• Auto navigate the planner agent into detail page;Filter askFollowupQuestion part in inline subtask display mode
• disable askFollowupQuestion options if this toolcall is not last part

Test plan

• Verify planner agent can ask clarification questions when requirements are ambiguous
• Verify planner agent runs in manual mode (not offhand)
• Verify existing agent behavior is unchanged

🤖 Generated with Pochi | Task

[codecov-commenter]

Codecov Report

❌ Patch coverage is 62.50000% with 39 lines in your changes missing coverage. Please review.
✅ Project coverage is 13.65%. Comparing base (9dc3f95) to head (63008e6).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
...ckages/vscode-webui/src/components/task-thread.tsx	0.00%	19 Missing ⚠️
packages/tools/src/new-task.ts	0.00%	6 Missing ⚠️
...eatures/tools/components/ask-followup-question.tsx	0.00%	6 Missing ⚠️
.../approval/components/tool-call-approval-button.tsx	0.00%	3 Missing ⚠️
...code-webui/src/features/tools/components/index.tsx	0.00%	2 Missing ⚠️
packages/cli/src/task-runner.ts	0.00%	1 Missing ⚠️
...code-webui/src/components/message/message-list.tsx	0.00%	1 Missing ⚠️
...vscode-webui/src/features/retry/hooks/use-retry.ts	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (62.50%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1254      +/-   ##
==========================================
+ Coverage   13.61%   13.65%   +0.04%     
==========================================
  Files         671      673       +2     
  Lines       59721    59958     +237     
  Branches     1749     1761      +12     
==========================================
+ Hits         8130     8189      +59     
- Misses      51320    51497     +177     
- Partials      271      272       +1     

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[wsxiaoys]

otherwise LG

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