fix(e2e): anchor dashboard snapshots

[tiankaima]

Summary

• add a snapshot-only dashboard clock anchor so seeded dashboard screenshots use DEV_SEED_ANCHOR instead of wall-clock time
• add atTime support for get_my_dashboard and get_next_class so MCP snapshots can render seeded next class/deadline/event data deterministically
• pass the snapshot anchor into the exams tab client filter so the default unfinished filter shows seeded exams

Snapshot Evidence

• fresh bun run snapshot:e2e completed for pages/API/MCP
• get_my_dashboard snapshot now reports nextClass, 5 upcoming deadlines, and 10 upcoming events
• /?tab=exams&snapshotAt=... now shows the 3 seeded exam cards instead of the empty filtered state

Verification

• bun run test:integration
• bun run verify:fast
• bun run test:e2e:prepare
• PLAYWRIGHT_REUSE_SERVER=0 bun run test:e2e

Note: bun run verify:full was first attempted while a manually-started standalone server was still running; Playwright reused that server with a localhost/127.0.0.1 origin mismatch, causing OAuth/MCP origin-sensitive failures. After stopping that server and rerunning E2E with PLAYWRIGHT_REUSE_SERVER=0, all 423 E2E tests passed.

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Project	Deployment	Actions	Updated (UTC)
server-nextjs	Error		May 15, 2026 6:24am

[Copilot]

Pull request overview

This PR makes dashboard and MCP snapshots deterministic by adding an optional anchored reference time for seeded snapshot flows and related dashboard/MCP views.

Changes:

• Adds snapshotAt dashboard page handling and passes anchored time into nav/overview/exams rendering.
• Adds atTime support to get_my_dashboard and get_next_class.
• Updates snapshot cases, integration coverage, and feature docs for anchored dashboard snapshots.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tools/dev/artifacts/snapshot-cases.ts	Adds snapshot anchor query/arguments for dashboard page and MCP cases.
tests/integration/mcp-tools.test.ts	Adds anchored dashboard assertions and stabilizes existing dashboard tests.
src/lib/mcp/tools/dashboard-tools.ts	Adds optional atTime parsing and forwarding for dashboard MCP tools.
src/features/home/server/dashboard-overview-data.ts	Allows dashboard overview/nav stats to use an injected reference time.
src/features/home/server/assistant-dashboard-snapshot.ts	Allows assistant dashboard snapshot generation to use an injected reference time.
src/features/home/components/home-view.tsx	Propagates anchored reference time to exams tab rendering.
src/features/home/components/exams-panel.tsx	Forwards anchored reference time to the exams list.
src/features/home/components/exams-list.tsx	Uses anchored time for completed/incomplete exam filtering.
src/app/page.tsx	Parses debug-only snapshotAt and passes anchored time into dashboard data/components.
docs/features/overview.json	Documents optional atTime support for dashboard MCP tools.

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