Add resizable inline right panels

[shivamhwp]

• Wrap plan and diff sidebars in a shared resizer
• Persist widths as ratios in local storage
• Simplify sidebar layout to use full-width content

What Changed

Added a reusable resizable right-panel wrapper and used it for the inline plan/tasks sidebar and inline diff panel. The panel now defaults to 40% of the available chat area, can be resized between 30% and 80%, and persists the chosen width separately for plan/tasks and diff panels.

Why

The plan/tasks sidebar was fixed-width, so users could not adjust the space split between the conversation and the right-side detail panel. A percentage-based resizer matches the requested behavior and keeps the layout proportional when the window or left sidebar changes.

UI Changes

Screen.Recording.2026-05-05.at.7.34.29.AM.mov

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
UI-only layout change that adds pointer-driven resizing and localStorage persistence; risk is limited to potential layout/interaction regressions on different screen sizes or pointer devices.

Overview
Adds a reusable ResizableRightPanel wrapper that lets inline right-side panels be drag-resized (default 40% width, clamped to 30–80%) and persists the chosen width ratio to localStorage.

Updates the chat plan/tasks sidebar and the inline diff viewer to use this shared resizer, switching the plan sidebar to fill its container (w-full) and simplifying the inline diff layout by removing the previous SidebarProvider/pixel-based resizing approach.

^{Reviewed by Cursor Bugbot for commit e03ecba. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add resizable inline right panels for the diff and plan sidebars

• Introduces ResizableRightPanel, a new component that lets users drag-resize a right panel. Width is stored as a ratio (default 40%, min 30%, max 80%) and persisted to localStorage.
• Wraps the inline plan sidebar in ResizableRightPanel with width persisted under chat_plan_sidebar_width_ratio.
• Rewrites the inline diff panel in _chat.$environmentId.$threadId.tsx to use ResizableRightPanel, replacing the previous pixel-based min/max constraints and SidebarProvider implementation.
• PlanSidebar in sidebar mode now uses w-full instead of a fixed w-[340px] to fill its resizable container.
• Behavioral Change: The diff panel no longer manipulates URL search params to force diff=1 open; open/close is controlled solely by diffOpen.

^{Macroscope summarized e03ecba.}

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[macroscopeapp]

Approvability

Verdict: Approved

This PR refactors sidebar resize functionality into a reusable ResizableRightPanel component while simplifying existing code (net -131 lines). Changes are purely client-side UI with no security, auth, or backend implications.

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Dismissing prior approval to re-evaluate 385b32c

[cursor]

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

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^{Reviewed by Cursor Bugbot for commit 8a193e5. Configure here.}

[cursor]

Inline diff panel loses "keep mounted" optimization on close

Medium Severity

The refactored DiffPanelInlineSidebar returns null when !diffOpen, fully unmounting the diff panel on every close. The old code used renderDiffContent (backed by shouldRenderDiffContent = diffOpen || hasOpenedDiff) to keep the content mounted even when the sidebar was visually hidden, preserving scroll position, view state, and the DiffWorkerPoolProvider worker pool. Now shouldRenderDiffContent is computed but unused in the inline path (it's only used in the sheet path at line 171), and toggling the diff panel repeatedly tears down and recreates the worker pool and component tree.

Additional Locations (1)

• apps/web/src/routes/_chat.$environmentId.$threadId.tsx#L140-L141

 

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