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• [feat] Simplify chat input UI with single-row layout for basic configurations #13364 👈 (View in Graphite)
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📈 Frontend coverage change detected

The frontend unit test (vitest) coverage has increased by 0.0100%

• Current PR: 86.5200% (12768 lines, 1720 missed)
• Latest develop: 86.5100% (12765 lines, 1721 missed)

✅ Coverage change is within normal range.

📊 View detailed coverage comparison

Summary

This PR refactors the ChatInput widget UI to use a single-row “simple mode” layout (textarea + send button side-by-side) when no file upload and no audio recording are enabled, while keeping the existing two-row layout for “extended mode”. It also introduces semantic theme size tokens for the chat input and updates a large set of Playwright snapshot images to match the new visuals.

Code Quality

Overall the refactor is clear and maintainable:

• Good extraction: Pulling the BaseWeb UITextArea overrides into createTextAreaOverrides reduces duplication and keeps simple/extended layouts consistent (frontend/lib/src/components/widgets/ChatInput/ChatInput.tsx L91-L141).
• Readable mode split: The isSimpleMode conditional cleanly separates the two layouts (ChatInput.tsx L671-L874).
• Theme tokens: Using theme sizes for chat input sizing is consistent with repo styling practices (frontend/lib/src/theme/primitives/sizes.ts L68-L72; frontend/lib/src/components/widgets/ChatInput/styled-components.ts L122-L156).

Nits / small maintainability notes:

• Inline style in JSX: Simple mode uses an inline style={{ marginBottom: ... }} on StyledSendIconButton (ChatInput.tsx L723-L734). This is minor, but the repo generally prefers Emotion styles over inline styles; it might be cleaner to encode this via a styled prop/variant (or in StyledSimpleRow).
• Style typing: rootLayoutStyle is typed as Record<string, string | number> (ChatInput.tsx L101-L103). Using React.CSSProperties (or a narrower type) would better constrain valid CSS values.

Test Coverage

• E2E coverage: The PR updates many existing Playwright snapshot PNGs (notably under e2e_playwright/__snapshots__/linux/st_chat_input_test/...), which is appropriate for a primarily-visual change. No e2e test code (*_test.py) changed—only expected snapshots—so the correctness signal is limited to “visuals match expectations”.
• Unit coverage: No TypeScript unit tests were added/updated. Given that the main functional change is layout branching, that’s acceptable, but a small RTL/Vitest test asserting the mode switch (simple vs extended) would make the behavior more robust against future refactors.

E2E best-practices note: since snapshot churn is large, it’s worth ensuring the screenshots remain as small/specific as possible (element-level where feasible) to reduce future maintenance (per .cursor/rules/e2e_playwright.mdc guidance).

Backwards Compatibility

• No public API changes and no protobuf changes.
• The behavior change is visual/layout only. The main compatibility risk is for users relying on custom CSS selectors/layout assumptions around stChatInput (e.g., expecting a two-row DOM structure). This seems low-risk but worth noting given the DOM re-structure in simple mode (ChatInput.tsx L704-L735 vs L737-L874).

Security & Risk

• No obvious security impact.
• Primary regression risk is layout/interaction (e.g., button alignment, overlap with the character counter, focus behavior). The code keeps accessible names for icon buttons via aria-label (ChatInput.tsx L727-L728, L803-L814, L838-L865), which is good.

Recommendations

1. Remove the inline style in simple mode by moving the vertical offset into Emotion styling (e.g., a StyledSendIconButton prop or a StyledSimpleRow rule) (ChatInput.tsx L723-L734).
2. Tighten the type of rootLayoutStyle to React.CSSProperties (or a narrower shape) to prevent accidental invalid CSS keys/values (ChatInput.tsx L101-L103).
3. Consider adding a small frontend test that renders ChatInput in both configurations and asserts:
   • simple mode renders a submit button and textarea in the single-row container
   • extended mode renders the action row and (when enabled) mic/upload controls
     This would complement the snapshot coverage and protect the branching logic.

Verdict

APPROVED: The refactor is clean, uses semantic sizing tokens, and the snapshot updates appear consistent with a UI-only change; only minor maintainability follow-ups are suggested.

This is an automated AI review. Please verify the feedback and use your judgment.