feat: customize editor toolbar

[kpal81xd]

Closes #2175

What's Changed

• Add an explicit toolbar edit mode entered from the toolbar context menu.
• Replace the PlayCanvas logo with the Editor's existing check icon while editing, and reuse its native visibility icon styling.
• Persist toolbar visibility and ordering while preserving the documented default order and reset behavior.

Manual smoke test

1. Right-click the Editor toolbar and select Edit Toolbar. The menu should dismiss, the PlayCanvas logo should become a check, and every available action should appear with a flat top-right eye control.
2. Drag MCP above Code Editor, hide MCP with its eye control, then click the check. MCP should disappear, the PlayCanvas logo should return, and the custom order should persist after reloading.
3. Re-enter edit mode, show MCP, and click the check. Right-click the toolbar and select Reset Toolbar; the default order and visibility should return.

Checks

• I confirm I have read the contributing guidelines.

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Project	Deployment	Actions	Updated (UTC)
editor	Ready	Preview	Aug 10, 2026 3:45pm