feat(web-ui): add chat full-width tiled toggle backed by appearance token - #2431
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1688mengdie wants to merge 2 commits into
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feat(web-ui): add chat full-width tiled toggle backed by appearance token#24311688mengdie wants to merge 2 commits into
1688mengdie wants to merge 2 commits into
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added 2 commits
August 23, 2026 14:14
… action hook Avoid re-rendering FlowChatHeader on arbitrary app state changes by replacing the full useApp() subscription with useToggleChatFullWidth(), a fine-grained action that reads the current value straight from the app manager. The read side keeps using the existing useChatFullWidth() useSyncExternalStore hook.
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Summary
Add a full-width tiled toggle to the chat FlowChatHeader. When enabled, the chat reading column (message list, composer, runtime-status, explore region, file-modifications bar) stretches edge-to-edge instead of capping at the hard-coded
900px; the layout returns to the centered900pxcolumn when toggled off, including when the chat pane is collapsed.A new appearance token
--bf-appearance-token-flowchat-content-max-width(default900px) replaces the hard-coded900px, so the full-width behavior is backed by the appearance token system.Closes #196
Type and Areas
Type: Feature / UI-UX
Areas: Web UI (also flows into desktop since it uses the web-ui)
Motivation / Impact
The chat reading column was capped at a fixed
900px, so on wide windows (or with side panels collapsed) users could not expand the conversation to use the available width, forcing a narrow centered column even when plenty of horizontal space existed. This adds an explicit full-width toggle so the user can choose between the narrow centered column and a full-width tiled chat.Verification
Local (already verified on the validated branch, before submission):
pnpm run type-check:web— passvitestfocused tests — 6 passed (includes the newsession-fullwidth-toggletest inFlowChatHeader.test.tsx)git diff --check(trailing whitespace) — cleanRemote: fork CI triggered on this PR (Frontend Build / Rust Build Check / CLI Tests / Cargo Deny / Shell Deploy).
Note: this is an AI-assisted change — test degree: 已测 (tested).
Reviewer Notes
Manual verification path (low risk, if you prefer to confirm visually):
900px.900pxcolumn.Checklist