Bug: Revisión panel not collapsable - View > Toggle Sidebar disabled + splitter min-width

Describe the bug

Right panel Revisión (No hay cambios rastreados) is permanently visible at ~50% width, no way to close or collapse it.

• Closing Contexto tab (x) only closes that tab, the Revisión split remains.
• Ver > Mostrar u ocultar barra lateral is disabled/greyed out (see screenshot 5).
• Ver > Mostrar u ocultar árbol de archivos button (tooltip on top-left of right panel) only toggles the inner Cambios del último turno sub-panel, not the outer Chat | Revisión split.
• Esc does nothing, dragging the central splitter stops at a min-width and cannot be dragged to 0.
• Persists after restart - panel opens again at same width.
• Clearing storage does NOT fix it: DevTools > Application shows only 1 key (opencode.desktop.window.*.last-active-url), Session storage and IndexedDB are empty (screenshot 6) -> layout is hardcoded default, not saved state.

To Reproduce

1. Open OpenCode Desktop (Win32)
2. Observe Chat | Revisión split 50/50
3. Try to close Revisión via x on tab, Esc, View > Toggle Sidebar, dragging splitter, localStorage.clear() + reload

Expected behavior

A way to collapse/close the outer Revisión panel: either enable View > Toggle Sidebar, add an explicit X to the panel header, or allow splitter to collapse to 0 (like VS Code Ctrl+B).

Environment

• OS: Windows 11 (win32)
• OpenCode Desktop (reported 2026-08-26)
• No extensions, fresh restart, Local storage only 1 key, IndexedDB empty

Screenshots

5 screenshots provided showing: Context panel, tab x behavior, Revisión with inner collapse, View menu disabled, DevTools Application empty storage.

Additional context

User expects full-width chat. Current min-width on splitter blocks full collapse. Not configurable. Should be bug (disabled menu) or enhancement (make panel closable) - filing as bug since menu item exists but disabled.