fix(web): prevent Windows titlebar shift after restore

[thiscallnet]

What Changed

Stabilizes the Windows desktop titlebar layout across minimize → restore transitions.

The last valid native window-controls geometry is preserved while the Window Controls Overlay is temporarily unavailable during restore, then refreshed once the restored window has settled.

Diff, Usage, Settings, and right-panel headers now use the same stabilized titlebar geometry. Other platforms keep the existing WCO behavior.

Why

On Windows desktop, restoring T3 Code after minimizing could briefly render titlebar content in the wrong position before snapping into place, including content shifting into the native minimize/maximize/close button area.

Preserving the last known-good geometry through the restore transition avoids rendering that intermediate layout while still allowing the native controls geometry to update normally afterwards.

UI Changes

Before

before.mp4

After

after.mp4

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
Desktop UI/layout only on Windows Electron; no auth, data, or API changes. Risk is limited to titlebar geometry regressions on other platforms if WCO sync behavior diverges.

Overview
Fixes a Windows desktop glitch where titlebar content jumped or overlapped the system buttons briefly after minimize → restore.

syncDocumentWindowControlsOverlayClass now keeps the last good native control geometry on Windows when the Window Controls Overlay is temporarily unavailable during restore: it can leave the wco class applied, writes --workspace-native-controls-width from getTitlebarAreaRect, and skips that preservation in fullscreen via new win32 fullscreen IPC from DesktopWindow.

CSS adds .electron-windows / .wco variables (fixed 40px topbar height, native-control insets) so layout does not depend on transitional env(titlebar-area-*) values during restore.

Headers (diff panel, settings, usage, right-panel sheet) switch from hardcoded h-[52px] / env(...) padding to workspace-topbar and --workspace-native-controls-inset.

^{Reviewed by Cursor Bugbot for commit 021bfb1. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix Windows titlebar shift after restore by preserving WCO layout during overlay hide

• Revamps syncDocumentWindowControlsOverlayClass in windowControlsOverlay.ts to track fullscreen state and overlay geometry separately, keeping the wco class active on Windows when the overlay becomes temporarily hidden (e.g. after restore from maximized) to prevent layout shift
• Adds CSS variables (--workspace-topbar-height, --workspace-native-controls-inset, etc.) under .electron-windows in index.css so components can size/pad consistently without hardcoded heights or calc() expressions
• Extends full-screen event listeners in DesktopWindow.ts to cover win32 in addition to darwin, so the renderer knows when to drop the preserved wco class during fullscreen
• Updates header rows in diff panel, settings, usage, and project settings pages to use workspace-topbar and var(--workspace-native-controls-inset) instead of fixed heights and calc-based padding

^{Macroscope summarized 021bfb1.}

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Approvability

Verdict: Approved 021bfb1

Self-contained Windows UI bug fix that prevents titlebar shift during window restore. Changes consolidate CSS layout calculations into variables and add Windows-specific logic to preserve geometry during visibility transitions. Limited to visual/layout behavior with no sensitive or functional impact.

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