feat(mobile): add chat link actions

[iscekic]

Summary

Adds a native Link actions sheet when long-pressing a rendered markdown link in both mobile chat experiences (agent-session messages and Kilo Chat), without changing normal tap behavior or the enclosing message's long-press behavior.

• Open link, Copy link, Share link, Cancel, with the exact destination URL (including query/fragment) shown and acted upon.
• Long-press on a link stops propagation so the parent message's long-press (copy / message-actions sheet) does not also fire.
• MarkdownText stays generic and opt-in via a new onLongPressLink callback; only the three chat call sites use the new ChatMarkdownText wrapper. security-agent/finding-analysis-panel.tsx is unchanged.
• Each platform operation (open/copy/share) has its own retryable error toast with Try again, isolated per-operation. Share dismissal is not treated as a failure.
• Links keep accessibilityRole="link", get an Opens in browser hint, and expose a Show link actions custom accessibility action when link actions are enabled.

Design & Plan

• Design: chat link actions design doc (approved prior to implementation)
• Plan: chat link actions implementation plan (approved prior to implementation)

Feature-state matrix

State	Coverage
Happy	Action-sheet identity/order, exact URL routing, and copy/open/share tests.
Unhappy, retryable	Rejected-dependency tests prove each operation's retry action reruns only that operation.
Unhappy, non-retryable	Not applicable — no known terminal failure classification for these local platform actions; established in tests.
Empty	Not applicable — the trigger only exists once react-native-marked emits a link with an href.

Checks

apps/mobile: pnpm test      -> 120 files / 780 tests passed
apps/mobile: pnpm typecheck -> pass
apps/mobile: pnpm lint      -> pass
apps/mobile: pnpm check:unused -> pass
apps/mobile: pnpm format:check -> pass
git diff --check origin/main...HEAD -> clean

A fresh, independent code review of the full diff reported no valid actionable findings.

Device E2E

Device E2E for this feature was blocked by two reproducible, pre-existing environment issues unrelated to this diff (no auth or networking files are touched here):

• iOS: the app reliably signs itself back out within ~1 second of reaching Home after a successful login, reproduced across 8 separate login attempts against 2 different test accounts, before any feature interaction was possible.
• Android: the emulator's guest network could not reach the host LAN IP the worktree's dev stack is configured with, so the app never got past a connectivity error.

This was investigated at length (see session evidence: nextjs request logs, screenshots, accessibility-tree dumps) and accepted as an environment blocker by the requesting human rather than a product regression. The automated suite above is the primary verification for this PR; device acceptance should be re-run once the local iOS/Android E2E environment issue is resolved.

Non-goals

• Non-chat markdown link actions (e.g. security findings).
• URL detection in plain text not rendered as a link by markdown.
• Browser chooser, link preview, download action, or a separate Copy text action.
• Backend, schema, dependency, native-config, or sibling-repository changes.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Executive Summary

Reviewed the full diff (11 files, ~630 lines) adding a chat link-actions sheet and retryable external-link opening; no high-confidence security, correctness, or breaking-API issues were found in the changed lines.

Files Reviewed (11 files)

• apps/mobile/src/lib/external-link.ts
• apps/mobile/src/lib/external-link.test.ts
• apps/mobile/src/components/agents/chat-link-actions.ts
• apps/mobile/src/components/agents/chat-link-actions.test.ts
• apps/mobile/src/components/agents/chat-markdown-text.tsx
• apps/mobile/src/components/agents/markdown-link.ts
• apps/mobile/src/components/agents/markdown-link.test.ts
• apps/mobile/src/components/agents/markdown-text.tsx
• apps/mobile/src/components/agents/message-bubble.tsx
• apps/mobile/src/components/agents/text-part-renderer.tsx
• apps/mobile/src/components/kilo-chat/message-markdown.tsx

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_{Reviewed by claude-sonnet-5 · Input: 24 · Output: 17.8K · Cached: 625.6K}

_{Review guidance: REVIEW.md from base branch main}