Keep custom sidebars fixed

[ComputelessComputer]

Disable resizing for settings, calendar, contacts, and templates sidebars while preserving the resizable timeline sidebar.

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Note

Low Risk
Desktop layout-only changes with targeted tests; no auth, data, or API impact.

Overview
Settings, calendar, contacts, and templates left sidebars are no longer user-resizable; only the timeline sidebar keeps drag-to-resize, persisted layout, and the visible resize handle.

ClassicMainBody gates resizing on canResizeLeftSidebarPanel (timeline chrome only). For custom-sidebar tabs it pins the panel at 200px (createFixedLeftSidebarPanelConstraints), uses fixed chrome width, skips autoSaveId, hides/disables the handle, and ignores layout callbacks so drag state cannot change width. LeftSidebar adds pr-1 on those special modes (not on timeline) for spacing under window chrome.

^{Reviewed by Cursor Bugbot for commit 0223ce4. Bugbot is set up for automated code reviews on this repo. Configure here.}

[netlify]

✅ Deploy Preview for old-char canceled.

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[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 2 potential issues.

There are 3 total unresolved issues (including 1 from previous review).

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