feat: code block rendering, syntax highlighting, and compose fixes#803

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worktree-wpfleger+mobile-code-block-parity

Commits on Jun 2, 2026

feat(mobile): styled code block rendering with copy button and auto-fence
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feat: add syntax highlighting to code blocks on desktop and mobile
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chore: add desktop E2E screenshots for code block verification
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chore: remove test evidence screenshots
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refactor(mobile): convert _MessageCodeBlock to HookWidget
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docs: document code block syntax highlighting for agents
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chore: add code block input rule fix screenshots
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fix(desktop): create code block on first-line fence + Enter
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chore: remove code block fix screenshots
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fix: add language label to desktop code blocks and remove broken mobile fence expansion
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refactor: code review fixes for code block rendering
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feat(desktop): add line numbers, diff rendering, and max-height scroll to code blocks
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chore: add missing mobile language label assertion and gitignore Playwright MCP logs
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