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

Medium Risk
Introduces new pointer-driven resizing logic and localStorage persistence for sidebar widths, which can affect layout behavior across screen sizes and input devices. Risk is moderate due to UI interaction complexity but remains confined to chat right-panel rendering.

Overview
Adds a shared ResizableRightPanel wrapper to make inline right-side panels draggable-resizable, persisting width as a clamped ratio (default 40%, 30–80%) in localStorage.

Updates the chat plan/tasks sidebar and the inline diff viewer to use this wrapper (with new *_width_ratio keys), and adjusts PlanSidebar sidebar mode to fill its container rather than enforce a fixed width. The diff route’s inline panel implementation is simplified by removing the previous SidebarProvider/pixel-constraint resizer in favor of the new ratio-based panel.

^{Reviewed by Cursor Bugbot for commit 52721c9. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add resizable inline right panels for Plan and Diff sidebars

• Introduces ResizableRightPanel, a generic draggable panel that clamps its width ratio between 30%–80% and persists it to localStorage.
• Wraps the inline Plan sidebar in ResizableRightPanel (stored under chat_plan_sidebar_width_ratio); PlanSidebar drops its fixed 340px width in favor of w-full.
• Replaces the SidebarProvider-based inline diff panel in _chat.$environmentId.$threadId.tsx with ResizableRightPanel (stored under chat_diff_sidebar_width_ratio), removing previous pixel-based min/max width constraints.
• Behavioral Change: both inline panels no longer have fixed pixel widths; users can drag to resize and the last width is restored on reload.

^{Macroscope summarized 52721c9.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

Introduces new user-facing behavior (resizable right panels) via a new component. While implementation is clean and simplifies existing code, new UI capabilities warrant human review.

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Dismissing prior approval to re-evaluate 385b32c

[cursor]

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

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

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Dismissing prior approval to re-evaluate 52721c9