Fix mobile chat layout/scrolling and transcript modal UX

[rushcreek]

Summary

• fix mobile chat transcript sizing so scrolling works in normal view
• add a read-only mobile transcript modal with explicit close action
• keep transcript expand control mobile-only and hide it on desktop
• fix markdown overflow edge cases for <pre> and inline <code> content
• avoid restoring Fleet filter to approvals by default on bootstrap
• add regression tests for transcript modal controls and markdown pre-wrap behavior

Validation

• npm run typecheck
• targeted unit tests for:
  • tests/unit/agentChatPanel-controls.test.ts
  • tests/unit/markdownPreWrapRegression.test.ts
  • tests/unit/studioBootstrapWorkflow.test.ts

[rushcreek]

Quick UX summary of what this fixes (mobile + chat stability):

Chat scrolling fixed in both normal and expanded transcript views.
Added read-only transcript modal on mobile with a clear Close action.
Added a small expand icon for discoverability, and ensured it’s hidden on desktop.
Fixed markdown overflow regressions caused by long

 and inline  content that could stretch chat width and hide controls.

Prevented Fleet from unexpectedly restoring the Approvals filter by default.

Added regression coverage for:

transcript modal controls

markdown pre-wrap safeguards

focused filter restore behavior

This should stabilize the mobile chat experience and prevent the same layout regressions from reappearing.

[chatgpt-codex-connector]

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[grp06]

fixed in the latest commit. So much changed it was impossible to merge. I cherry picked your work, thanks for contributing! I'll make sure to merge PRs in a more timely manner next time so your contributions count!