Grok 4.3, web sources UX, and mobile polish

[MaheshtheDev]

Stacked on top of #1004 (Nova chat attachments). Builds on that branch with model, web-source, and mobile improvements.

Grok 4.3

• Add Grok 4.3 as a selectable model and the default

Composer toolbar (web)

• Reorder to model · attach · reasoning … space · send (new toolbarTrailing/toolbarEnd slots)
• Icon-only reasoning click-toggle (Instant ↔ Thinking) with hover label + directional roll
• Lighter model dropdown (translucent surface, subtle selected row, open/close animation, chevron rotation)
• Borderless ghost controls; loader lives in the composer status strip ("Searching the web…" / "Thinking…")

Web sources / citations

• Single favicon sources pill (hover-reveal), citation hover cards (favicon + domain/path)
• Web-search indicator collapsed to one status-strip line (no stuck spinners)
• Merge text runs split by source-url; keep source parts on thread reload
• Strip tool parts on send (fixes tool_use/tool_result mismatch on follow-ups)

Mobile

• Sticky full-width bottom bar (icon-over-label), Nova orb centered
• Chat view fixed to h-dvh → composer pinned; back button in chat; nav hidden in chat
• Safe-area + spacing fixes for the home composer

Fixes

• SelectSpacesModal a11y (DialogTitle)
• Delete-document toast surfaces the real server error
• Markdown: hide redundant ---, fix detached list bullets

[claude]

Claude finished @MaheshtheDev's task in 2m 11s —— View job

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Review Complete

• Fetch PR diff and existing review comments
• Analyze changes for bugs, security issues, and logic errors
• Review tool parts sanitization logic
• Review citation/web sources implementation
• Review mobile layout changes
• Submit review findings

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Overview: Adds Grok 4.3 as the default model, improves web sources UX with citation hover cards and a collapsible sources pill, fixes mobile layout/navigation, and addresses several bugs including tool_use/tool_result mismatches and a11y issues.

Issues found: None — this looks good to ship.

Key changes reviewed:

• Tool parts sanitization (index.tsx:356-363): Correctly strips tool parts before sending to backend, fixing the tool_use/tool_result mismatch on follow-up messages.

• Text run merging (agent-message.tsx:583-599): Properly coalesces text parts split by source-url citations to prevent broken markdown rendering.

• Citation hover cards (agent-message.tsx:72-120): Clean implementation with proper URL parsing and graceful fallbacks.

• WebSourcesPill click-outside (agent-message.tsx:171-181): Correct useEffect cleanup — no memory leak.

• A11y fix (select-spaces-modal.tsx): Changed <p> to <DialogTitle> for screen reader accessibility.

• Error message extraction (use-document-mutations.ts:10-19): Handles {error}, {message}, and string formats cleanly.

Score: 9/10

Solid PR with good attention to edge cases.

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[claude]

Overview: Adds Grok 4.3 as the default model, improves web sources UX with citation hover cards and a collapsible sources pill, fixes mobile layout/navigation, and addresses several bugs including tool_use/tool_result mismatches and a11y issues.

Issues found: None — this looks good to ship.

Key changes reviewed:

• Tool parts sanitization (index.tsx:356-363): Correctly strips tool parts before sending to backend, fixing the tool_use/tool_result mismatch on follow-up messages.
• Text run merging (agent-message.tsx:583-599): Properly coalesces text parts split by source-url citations to prevent broken markdown rendering.
• Citation hover cards (agent-message.tsx:72-120): Clean implementation with proper URL parsing and graceful fallbacks.
• A11y fix (select-spaces-modal.tsx): Added missing DialogTitle — good catch.
• Error message extraction (use-document-mutations.ts): The new fetchErrorMessage helper handles multiple error formats cleanly.

Score: 9/10

Solid PR with good attention to edge cases. The only minor observation (not blocking) is that the WebSourcesPill click-outside handler could potentially be replaced with a Radix/headless popover for consistency, but the current implementation is correct.

[claude]

Overview: Adds Grok 4.3 as the default model, improves web sources UX with citation hover cards and a collapsible sources pill, fixes mobile layout/navigation, and addresses several bugs including tool_use/tool_result mismatches and a11y issues.

Issues found: None — this looks good to ship.

Key changes reviewed:

• Tool parts sanitization (index.tsx:356-363): Correctly strips tool parts before sending to backend, fixing the tool_use/tool_result mismatch on follow-up messages.
• Text run merging (agent-message.tsx:583-599): Properly coalesces text parts split by source-url citations to prevent broken markdown rendering.
• Citation hover cards (agent-message.tsx:72-120): Clean implementation with proper URL parsing and graceful fallbacks.
• A11y fix (select-spaces-modal.tsx): Added missing DialogTitle — good catch.
• Error message extraction (use-document-mutations.ts): The new fetchErrorMessage helper handles multiple error formats cleanly.

Score: 9/10

Solid PR with good attention to edge cases. The only minor observation (not blocking) is that the WebSourcesPill click-outside handler could potentially be replaced with a Radix/headless popover for consistency, but the current implementation is correct.

[MaheshtheDev]

• Grok 4.3, web sources UX, and mobile polish #1064 👈 (View in Graphite)
• implement Nova chat attachments on the web side  #1004
• main

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