fix(designer): avoid remount update loop

[l1shen]

Summary\n- avoid republishing unchanged Variable projections during designer reconciliation\n- prevent the Runs-to-Design remount path from synchronously notifying external-store subscribers during commit\n- bump the published packages to 0.1.0-alpha.16\n\n## Verification\n- bun run check\n- bun run test\n- bun run build\n- bun run test:package

[coderabbitai]

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📒 Files selected for processing (4)

• packages/command/package.json
• packages/open-flow/package.json
• packages/open-flow/src/designer/browser/graph/FlowDesigner/FlowDesignerView.test.tsx
• packages/open-flow/src/designer/browser/graph/FlowDesigner/FlowDesignerView.tsx

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Summary by CodeRabbit

• Bug Fixes

  • Improved Flow Designer remount behavior to preserve existing variable inputs and names when the underlying model is unchanged.
  • Reduced unnecessary state updates, helping maintain stable designer state and responsiveness.

• Tests

  • Added regression coverage for preserving variable projections during remounts.

• Chores

  • Updated package versions to 0.1.0-alpha.16.

Walkthrough

FlowDesignerView.#syncModel now compares incoming variable inputs, variable names, and loading state with current values before updating reactive state. A regression test verifies that unchanged variable projections retain referential identity after remounting. The command and open-flow package versions increase from 0.1.0-alpha.15 to 0.1.0-alpha.16.

Merge Risk: ⚪ Minimal · up to 4c202

This change prevents redundant designer updates and remount-time subscriber notifications while adding focused test coverage; no actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title follows the required <type>(<scope>): <subject> format, uses English, and accurately describes the remount update-loop fix.
Description check	✅ Passed	The description directly explains the projection update-loop fix, package version bump, and verification commands.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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