💡 Change Scope

• Small Change: Fast feedback, localized UI/logic, low-risk.
• Large Change: New feature, cross-boundary logic, runtime-risk (persistence, IPC, lifecycle, recovery).

📝 What Does This PR Do?

Adds a faster minimap navigation gesture for the infinite canvas: users can now double-click a region in the bottom-right minimap to center the main viewport on that area without changing the current zoom level.

This keeps the existing node-focus behavior intact while introducing a separate viewport navigation semantic for region jumps. The implementation also adds web-canvas regression coverage for the new interaction.

🏗️ Large Change Spec (Required if "Large Change" is checked)

1. Context & Business Logic

The workspace canvas already supports minimap pan and zoom, but it lacked a fast way to jump to a distant area. This PR adds a minimap double-click interaction that re-centers the viewport on the clicked flow position while preserving the current zoom ratio.

2. State Ownership & Invariants

• Viewport state remains owned by React Flow plus the existing renderer-side viewportRef / onViewportChange synchronization path.
• Double-click minimap navigation must only change viewport translation; it must not normalize or override the current zoom.
• Existing minimap single-click, pan, and zoom interactions must remain intact.

3. Verification Plan & Regression Layer

The behavior is locked down at the E2E layer with a web-canvas Playwright regression that zooms the canvas, double-clicks a distant minimap region, and asserts that the viewport center moves while the zoom value stays unchanged.

✅ Delivery & Compliance Checklist

• My code passes the ultimate gatekeeper: pnpm pre-commit is completely green.
• I have signed the CLA if required (see CLA.md).
• I have included new tests to lock down the behavior (or explicitly stated why it's untestable).
• I have strictly adhered to the DEVELOPMENT.md architectural boundaries.
• I have attached a screenshot or screen recording (if this touches the UI).
• I have updated the documentation accordingly (if adding a feature or changing a contract).

📸 Screenshots / Visual Evidence

UI interaction change. Screenshot or recording will be attached in the GitHub PR UI.