fix(web): dismiss mobile sidebar sheet after navigation

[henrik092]

On mobile, the sidebar renders as a slide-over sheet. After tapping a thread, creating a new thread, or navigating to settings, the sheet stays open and must be manually dismissed.

Add a closeMobileSidebar() helper that calls setOpenMobile(false) when isMobile is true, and invoke it after:

• plain-click thread navigation (handleThreadClick)
• programmatic thread navigation (navigateToThread)
• new thread creation
• settings navigation

Fixes #1258

What Changed

Why

UI Changes

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Note

Low Risk
Low risk UI behavior change limited to calling setOpenMobile(false) after user-initiated navigations; minimal impact outside mobile and no data/auth logic touched.

Overview
Ensures the mobile sidebar (sheet) auto-dismisses after navigation actions.

Sidebar now uses useSidebar() to add a closeMobileSidebar() helper and calls it after thread navigation (click and keyboard/programmatic), after creating a new thread from a project, and after navigating to Settings.

^{Written by Cursor Bugbot for commit be06b7b. This will update automatically on new commits. Configure here.}

Note

Dismiss mobile sidebar sheet after navigation in Sidebar

On mobile, the sidebar sheet previously stayed open after navigating to a thread, creating a new thread, or opening Settings. A closeMobileSidebar callback (via useSidebar) is now called after each navigation action in Sidebar.tsx, so the sheet closes automatically on mobile.

^{Macroscope summarized be06b7b.}

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