refactor(chat): clean up the deployed chat surface

[waleedlatif1]

Summary

Eight-angle cleanup pass (effects, state, memo, callback, React Query, url-state, emcn, comments) run over the full contents of the deployed chat surface and the speech code that survived the voice-mode removal — not just a diff.

Dead code

• enforceChatRateLimit — added for the TTS relay in fix(security): meter and throttle the deployed-chat TTS relay #6212, orphaned when chore(chat): remove deployed-chat voice mode #6215 deleted that route. Zero consumers.
• ChatToolCallStatus, ChatErrorType, and six unused CHAT_ERROR_MESSAGES keys (only GENERIC_ERROR and CHAT_UNAVAILABLE are read).
• scrollToMessage was declared and destructured by ChatMessageContainer but never used in its body. Removing the prop also made the scrollToShowOnlyMessage branch unreachable, since the one caller passed true.
• permissionState and the language prop on useSpeechToText — both write-only across the repo.
• The image branch in ChatFileDownload's renderIcon returned the same DefaultFileIcon at the same size as the fallback.
• chatKeys.status/detail — aliases nothing imported, and misleading since they root under ['deployments', …] rather than chatKeys.all.

Redundant state

• password-auth and email-auth each kept a boolean in lockstep with errors.length > 0; email-auth also validated on every keystroke and then immediately hid the result.
• file-download tracked hover in state to drive one opacity class → group-hover. Verified emcn Button sets no group class of its own.

Memoization

• ChatMessageContainer's memo() could never bail: chat.tsx passes an inline arrow for scrollToBottom and displayMessages is a fresh array. Four of the five things that re-render ChatClient are its props anyway, so the memo is dropped rather than propped up.
• ClientChatMessage keeps its memo — it blocks markdown re-parsing during streaming — but loses the custom comparator, which compared proxies (a key:status fingerprint, files by length) and ignored attachments and type entirely. Default shallow compare on its single prop is simpler and stricter.
• Six useCallbacks whose consumers are native DOM handlers or inline arrows.

Effects

• The scroll listener attached in an effect keyed on [chatConfig, authRequired] — values it never reads, standing in for "the container has mounted". Now a ref callback, so it no longer re-attaches on every config refetch.

Design system / a11y

• z-[100] → z-[var(--z-dropdown)] (identical value), shadow-lg → shadow-medium, inline list styles → Tailwind, hover: → hover-hover: on touch-reachable targets, Check sourced from emcn alongside its Duplicate pair.
• Accessible names on the remove-attachment, stop, and send buttons — all previously announced as just "button".
• Dropped a keyboard handler on a role='group' div with no tabIndex (so target === currentTarget was unreachable), plus the Tooltip.Provider wrappers and delayDuration, which emcn documents as no-op passthroughs.

Needs a visual check

The scroll-listener change is the one behavioral risk. Please verify on a deployed chat: scroll up mid-conversation → jump-to-bottom button appears; click it → re-pins and hides; stream a reply while scrolled away → does not auto-follow.

shadow-lg → shadow-medium is a small deliberate shadow change on the jump-to-bottom pill.

Deliberately not included

• useSpeechToText fetching server state in an effect into useState — should become a useQuery, but its only consumer is the workspace home input, and the render path is hydration-sensitive. Wants its own PR.
• A real missing-invalidation bug: useUpdateChat doesn't invalidate deploymentKeys.info/versions/deployedState, though the PATCH can trigger a redeploy (api/chat/manage/[id]/route.ts calls performFullDeploy). useCreateChat invalidates for exactly this reason. Left out because it changes deployment-panel behavior I can't verify here — worth its own PR.
• Visual-risk items needing design sign-off: border-purple-500 drag state, text-purple-500 audio icon, off-scale text-sm/text-lg, the stop glyph → emcn Square, and consolidating the two chat auth screens onto the shared (auth)/components kit (which would shrink headings 40px → 32px).

Type of Change

• Refactor / dead code removal

Testing

1153 tests pass across chat, speech, settings, hooks and rate-limiter. Typecheck clean on apps/sim. Lint warnings in scope unchanged from staging's baseline (2). No behavior change intended except the two items called out above.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Aug 3, 2026 7:48pm

[cursor]

PR Summary

Medium Risk
The ref-callback scroll listener is the main behavioral change—verify jump-to-bottom and stick-to-bottom while streaming. Removing language from STT WebSocket params may affect non-default language transcription if anything relied on it.

Overview
Refactors the deployed chat UI and related speech/query helpers: mostly dead-code removal, simpler React patterns, and design-system alignment—not new product behavior (aside from scroll wiring and a few visual tokens).

Scroll and layout (chat.tsx) — Replaces a scroll useEffect keyed on unrelated chatConfig/authRequired with a ref callback (attachMessagesContainer) so the listener attaches when the message container actually mounts after auth/loading gates. Simplifies scrollToMessage (drops unused offset branch and container prop). Drops several useCallbacks where nothing memoized depended on them.

Components — Removes memo from ChatMessageContainer (props were unstable); keeps ClientChatMessage memo but drops the custom comparator. Removes unused scrollToMessage prop from the container. Auth forms derive error visibility from errors.length instead of duplicate booleans; email no longer validates on every keystroke.

Design / a11y — z-[100] → z-[var(--z-dropdown)], shadow-lg → shadow-medium, list styles → Tailwind utilities, hover: → hover-hover: on touch targets. Adds aria-label on remove/stop/send; uses handleKeyboardActivation for attachment previews. Drops redundant Tooltip.Provider wrappers in chat input/messages.

Dead code — Removes enforceChatRateLimit, unused CHAT_ERROR_MESSAGES keys and ChatErrorType, chatKeys.status/detail aliases, ChatToolCallStatus, permissionState and language from useSpeechToText, hover state in file download (group-hover instead).

Speech — useSpeechToText no longer tracks mic permission or passes language_code to ElevenLabs WS (if that was intentional cleanup vs regression, worth a quick product check).

^{Reviewed by Cursor Bugbot for commit 0f1f509. Configure here.}

[greptile-apps]

Greptile Summary

This PR simplifies the deployed chat surface without intending broader behavioral changes.

• Replaces redundant state, effects, callbacks, and memoization.
• Removes unused chat, speech, query-key, and rate-limiter code.
• Updates chat styling and accessible control labels.
• Restores Markdown list markers using Tailwind list utilities.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains; the previously reported Markdown list-marker regression is corrected by effective Tailwind list utilities.

Important Files Changed

Filename	Overview
apps/sim/app/(interfaces)/chat/components/message/components/markdown-renderer.tsx	Replaces inline list styles with equivalent Tailwind utilities; the previously reported missing-marker regression is fixed.
apps/sim/app/(interfaces)/chat/[identifier]/chat.tsx	Refactors scroll-listener attachment to a callback ref and simplifies scrolling callbacks.
apps/sim/app/(interfaces)/chat/components/input/input.tsx	Removes redundant wrappers and callback memoization while adding accessible labels to icon-only controls.
apps/sim/app/(interfaces)/chat/components/message/message.tsx	Simplifies message memoization and adopts the shared keyboard-activation helper.
apps/sim/hooks/use-speech-to-text.ts	Removes unused speech-to-text state and parameters without changing the retained transcription flow.

_{Reviews (2): Last reviewed commit: "fix(chat): restore markdown list markers" | Re-trigger Greptile}

[waleedlatif1]

@greptile

[waleedlatif1]

@cursor review

[cursor]

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit 0f1f509. Configure here.}