fix(lineage): clear stale focused graph during navigation

[seonghobae]

Outcome

Follow-up to protected #609: clears the previous focused graph immediately when the selected post changes, so a new post cannot briefly display the prior post’s isolation reason while its own authorized graph loads.

Verification

• focused isolation regressions: 2 passed
• frontend lint passed
• production build passed

The explicit 15-second test budget accommodates the heavily contended local host; the test itself completed in seconds once its worker started.

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Configuration used: Organization UI

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Run ID: a30af70a-0878-4abc-8141-f4ded7cce2a2

📥 Commits

Reviewing files that changed from the base of the PR and between 3f47348 and 2c50d8b.

📒 Files selected for processing (5)

• frontend/src/App.test.tsx
• frontend/src/App.tsx
• frontend/src/components/WorkspaceCalendar.tsx
• frontend/src/focusedGraphSelection.test.ts
• frontend/src/focusedGraphSelection.ts

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[seonghobae]

Exact-head 09204a4 keeps the focused graph null until the authorized per-post fetch resolves, so navigation shows the existing Loading lineage state instead of a transient global graph. The now-unused global graph fetch/state were deleted. Focused isolation tests, lint, and production build pass.

[devin-ai-integration]

Devin Review found 1 new potential issue.