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Ali Waseem
846706bc50
## Summary Fixes FE-3955 / [SUPABASE-APP-K41](https://supabase.sentry.io/issues/7613475596/) — a crash affecting 101 users (502 occurrences, escalating) since the "maximise AI assistant" feature (#47954) shipped on 2026-07-15. `DefaultLayout` calls `panelRef.current.collapse()` / `.resize()` on the `panel-content` resizable panel whenever the AI assistant sidebar is maximised. Below the `md` breakpoint, `LayoutSidebar` renders no panel at all (the sidebar shows as a mobile sheet instead), leaving `panel-content` as the *only* panel in the `ResizablePanelGroup`. `react-resizable-panels`' resize algorithm assumes a neighboring panel exists to pivot against, so with a single panel it computes an invalid pivot index of `-1` and throws `Panel constraints not found for index -1`. This guards the effect with the same `isMobile` breakpoint check `LayoutSidebar` already uses, so we never call `collapse()`/`resize()` when there's no sibling panel to resize against. ## Test plan - [ ] On a narrow viewport (or actual mobile device), open the AI assistant and toggle maximise — should no longer throw - [ ] On desktop, confirm maximise/minimise still resizes the content panel as before <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Bug Fixes** * Fixed a mobile layout issue where the sidebar could collapse or resize incorrectly, leading to runtime errors. * Improved the sidebar’s resize/collapse behavior on mobile devices to keep the layout stable. <!-- end of auto-generated comment: release notes by coderabbit.ai -->