fix(mobile): display proposed plans in thread feed

[tomhhealy]

What Changed

• Add proposed plans to the mobile thread feed using the existing thread.proposedPlans data.
• Display plans in a dedicated Markdown card with:
  • the plan title
  • copy support
  • expand/collapse controls for long plans
  • accessible labels and expansion state
• Keep proposed plans visible when their completed turn is folded.
• Respect the currently loaded message window when constructing the feed.
• Add focused tests for plan formatting and feed presentation.
• Document Plan Mode behavior for users.

Why

The mobile app was receiving the proposed-plan data but not adding it to the thread feed - completed plans were not visible in the conversation hindering usability of the plan mode in the mobile app.

REndering the data as a dedicated feed entry brings mobile in line with the web experience without changing contracts, provider adapters, or orchestration behavior. Keeping the plan outside the folded work entries ensures users can still find and copy the result after a turn completes.

UI Changes

Non-visible plan on the left, plan mode visible on the right (this PR).

Before	After

Testing

• vp test run apps/mobile/src/features/threads/proposedPlan.test.ts apps/mobile/src/lib/threadActivity.test.ts
• 2 test files passed, 19 tests passed.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes

Note

Display proposed plans as cards in the mobile thread feed

• Adds a proposed-plan feed entry type to buildThreadFeed in threadActivity.ts, pulling from thread.proposedPlans and ordering them by createdAt alongside other entries.
• Renders proposed plans as ProposedPlanCard components in ThreadFeed.tsx, with assistant markdown styles, link press handling, and skill props.
• Adds utility functions in proposedPlan.ts to extract the plan title, strip the title/summary heading from the displayed body, and build a collapsed preview with an ellipsis for long plans.
• Fixes stripDisplayedPlanMarkdown in apps/web/src/proposedPlan.ts to correctly skip leading blank lines before dropping the title and summary headings.

^{Macroscope summarized a982546.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR introduces new user-facing functionality by adding proposed plan display to the mobile thread feed. While the implementation follows existing web patterns and includes good test coverage, new features with new UI components and data flow warrant human review.

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