fix(web): mod+b toggles the sidebar unless composer text is selected

[SepehrRajabi]

Problem

On macOS, Cmd+B almost never toggles the main sidebar. With rich text on (the default since #12160), the composer takes Mod+B for bold whenever it has focus, and the app keeps focus in the composer nearly all the time. The shortcut only works after focus is moved somewhere else.

To reproduce: open any thread, leave the caret in the composer, and press Cmd+B. The sidebar stays open, and bold is quietly switched on for the next characters you type.

Change

SidebarControl's capture-phase handler used to yield Mod+B to the composer whenever the target was inside the rich-text composer. Now it yields only when the window selection isn't collapsed, meaning composer text is selected.

• Text selected in the composer: Cmd+B bolds it, as before.
• Nothing selected: Cmd+B toggles the sidebar, the same as everywhere else in the app.
• Bold while typing: still available by typing **.

The plain-text composer and non-Latin layouts (#13409) are unaffected. The doc comment on isRichTextBoldShortcut now describes the new condition.

Scope and approval

This is a small, focused fix: the configured sidebar.toggle shortcut was effectively dead in the app's most common focus state. It changes one condition in the web layout's shortcut handler. Desktop wraps the same web UI, and mobile has no sidebar shortcut. This does change how Cmd+B with no selection behaves inside the composer: it used to switch on bold for the next characters typed, and now it toggles the sidebar. If maintainers would rather keep that, I'm happy to rework or close this.

Verification

Manual checks in a local dev build (web, macOS, rich text on), reading the sidebar's data-state and the composer HTML after each key press:

• Empty composer with focus: Cmd+B collapses the sidebar; pressing again expands it. Focus stays in the composer.
• Text with the caret collapsed: Cmd+B toggles the sidebar. Text typed afterwards isn't bold.
• Text selected: Cmd+B wraps it in <strong> and the sidebar doesn't change.
• Focus outside the composer: Cmd+B toggles the sidebar, as before.

vp test run src/keybindings.test.ts passes (133). vpr typecheck in apps/web and vp lint on the changed files are clean.

Recordings (sidebar thread titles blurred for privacy):

• Before (main): Cmd+B twice in the composer, sidebar never moves. https://raw.githubusercontent.com/SepehrRajabi/t3code/pr-assets/sidebar-shortcut/before.mp4
• After: Cmd+B collapses and reopens the sidebar, then selecting a word and pressing Cmd+B bolds it. https://raw.githubusercontent.com/SepehrRajabi/t3code/pr-assets/sidebar-shortcut/after.mp4

I didn't test the packaged Electron app or Windows/Linux (Ctrl+B); the code path is shared.

Model: Claude Opus 5.5, via Claude Code running in T3 Code.

🤖 Generated with Claude Code

Fixes #17021

[macroscopeapp]

Approvability

Verdict: Approved at b279353

Macroscope's review found this PR approvable — The change narrowly fixes Mod+B routing in the rich-text composer: selected text still receives bold formatting, while a collapsed selection allows the existing sidebar toggle to run. The second file only updates documentation, and no product defaults or static-analysis settings are modified.

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📥 Commits

Reviewing files that changed from the base of the PR and between b279353 and ea1a1d5.

📒 Files selected for processing (1)

• apps/web/src/components/AppSidebarLayout.tsx

🚧 Files skipped from review as they are similar to previous changes (1)

• apps/web/src/components/AppSidebarLayout.tsx

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📝 Walkthrough

Walkthrough

The sidebar toggle now yields Mod+B to rich-text formatting only when the event targets a rich-text composer and a non-collapsed selection has both endpoints inside it. The keybinding documentation now states this condition.

Changes

Sidebar shortcut handling

Layer / File(s)	Summary
Gate shortcut yielding on text selection apps/web/src/components/AppSidebarLayout.tsx, apps/web/src/keybindings.ts	The sidebar toggle yields Mod+B to rich-text formatting when the selection is non-collapsed and both endpoints are inside the composer. The keybinding documentation reflects this condition.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to ea1a1

Mod+B preserves bold formatting for selected composer text and otherwise toggles the sidebar. No actionable merge risk was established.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly and concisely describes the main change: Mod+B toggles the sidebar unless composer text is selected. It uses the repository's conventional commit format.
Description check	✅ Passed	The description includes all required sections. It explains the problem, expected behavior, implementation, scope, approval rationale, manual verification, test results, limitations, recordings, and a…

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Inline comments:
Review comments at @apps/web/src/components/AppSidebarLayout.tsx:
- Line 109: Update the rich-text shortcut guard in the keydown handler so it
yields only when both selection endpoints belong to the matched composer. Keep
the existing non-collapsed-selection check, and allow the sidebar toggle to
proceed when the selection is outside the composer.

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📥 Commits

Reviewing files that changed from the base of the PR and between b438198 and b279353.

📒 Files selected for processing (2)

• apps/web/src/components/AppSidebarLayout.tsx
• apps/web/src/keybindings.ts

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