Merge latest origin/main and reconcile workspace side-panel conflicts

[Copilot]

This updates the branch to the current origin/main and resolves the workspace conflicts where the branch’s File Explorer side-panel work overlapped with mainline’s newer vertical-tab workspace layout. The merged result keeps the latest left-tab-bar layout model while preserving the ability to switch the shared side panel between Wave AI and File Explorer.

• Workspace layout model

  • Rebased the branch’s side-panel state onto the newer origin/main workspace layout implementation.
  • Preserved activePanelAtom and fileexplorer support on top of the new outer/inner panel-group layout.
  • Kept the shared side panel semantics: panel visibility remains separate from which panel content is active.

• Workspace rendering

  • Resolved workspace.tsx by keeping the new vertical-tab-bar structure from origin/main.
  • Restored conditional side-panel rendering so the left panel can host either:
    • AIPanel
    • FileExplorerPanel

• Tab bar behavior

  • Updated the vertical tab bar AI toggle to use the active side-panel state, matching top tab bar behavior and avoiding regressions when File Explorer owns the side panel.

{tabId !== "" &&
    (activePanel === "fileexplorer" ? (
        <FileExplorerPanel />
    ) : (
        <AIPanel roundTopLeft={showLeftTabBar} />
    ))}

• Result
  • Brings in the latest origin/main changes without dropping the branch-specific File Explorer panel flow.
  • Aligns workspace/tab UI behavior around a single source of truth for side-panel selection.

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