fix: destroy sidebar extensions on tab switch

[yzxcj797]

Summary

Key the sidebar extension slot by the active tab ID so tab replacement unmounts the previous extension and runs custom destroy cleanup.

Changes

• What: Force ExtensionSlot replacement when activeSidebarTab changes; add regression coverage for custom-to-custom and custom-to-built-in switches.

Review Focus

The sidebar panel is currently rendered by GraphCanvas, not SideToolbar.

Fixes #4372

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Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between bb47e34 and 037df76.

📒 Files selected for processing (2)

• src/components/graph/GraphCanvas.sidebarExtension.test.ts
• src/components/graph/GraphCanvas.vue

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