Reduce start recording sidebar collapse cost

[ComputelessComputer]

Unmount hidden timeline content when the left sidebar collapses and skip redundant collapse updates when recording starts.

---

Note

Low Risk
Mostly lifecycle and data-flow refactors with tests; the hydration gate slightly changes when default summaries are created.

Overview
Reduces work when the left sidebar collapses (especially at recording start) by dropping forceMount on ClassicMainSidebar, so hidden timeline content unmounts instead of staying mounted behind the collapse animation.

Moves session note UI state up to TabContentNoteInner so editor tabs, current view, transcript-tab visibility, and tab changes are computed once and passed into NoteInput (with createEditorTabs, getCanShowTranscript, and computeCurrentNoteTab exported/shared for that path). NoteInput now either renders with those props or falls back to the old hook-driven wrapper.

Default summary rows are created via useEnsureDefaultSummaryFromState with enabled: contentHydrated, avoiding ensureNote before session content has loaded. Tests cover the disabled case and updated sidebar collapse expectations.

^{Reviewed by Cursor Bugbot for commit 8b8a826. Bugbot is set up for automated code reviews on this repo. Configure here.}

[netlify]

✅ Deploy Preview for old-char ready!

Name	Link
🔨 Latest commit	808f09c
🔍 Latest deploy log	https://app.netlify.com/projects/old-char/deploys/6a488f276532e800089abac0
😎 Deploy Preview	https://deploy-preview-5901--old-char.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
🤖 Make changes	Run an agent on this branch

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit 4199771. Configure here.}

[cursor]

Custom sidebar unmounts when collapsed

Medium Severity

Removing forceMount from ClassicMainSidebar makes ClassicMainSidebar return null whenever leftsidebar.expanded is false, including on custom-sidebar tabs (settings, calendar, contacts, templates). After useStartListening calls setExpanded(false), those tabs can stay active with the sidebar locked but no LeftSidebar UI.

 

^{Reviewed by Cursor Bugbot for commit 4199771. Configure here.}