feat(frontend): make investigation overview replay-first

[ThomsenDrake]

Summary

• make the investigation overview replay-first with curated replay surfaced at the top
• add evidence-linked revelation, gap, and action drill-down across replay and wiki context
• preserve lazy graph mounting by handing wiki drawer opens across the investigation tabs

Verification

• npm test -- src/components/OverviewPane.test.ts src/components/InvestigationPane.test.ts src/components/GraphPane.test.ts src/api/invoke.test.ts

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[ThomsenDrake]

@codex

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Invalidate pending replay loads on session switch

Bump or cancel the replay request sequence when handling session-changed; otherwise an in-flight loadReplay from the previous session can still pass the seq !== replaySeq guard and overwrite the newly reset pane with stale history. This happens when the user switches sessions while getSessionHistory(...) is still resolving, because this reset block clears UI state but does not invalidate older requests.

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