chore: fix flakey e2e tests

[kmendell]

Checklist

• This PR is not opened from my fork’s main branch
• All new user-facing strings are translated via Paraglide (m.*())

What This PR Implements

Fixes:

Changes Made

Testing Done

AI Tool Used (if applicable)

Additional Context

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Confidence Score: 5/5

The PR appears safe to merge; no actionable regressions remain in the changes reviewed.

Summary

This PR makes the E2E suite more deterministic and diagnosable.

• Runs browsers in an isolated, version-matched Playwright container on Linux.
• Adds explicit cleanup, request synchronization, dialog readiness checks, and failure diagnostics.
• Replaces timing-sensitive waits and adjusts CI artifact collection and test setup.
• Fixes the previously reported dashboard fake-clock progression by explicitly advancing through the 10-second and 12-second transitions.

_{Reviews (2) · Last reviewed commit: "chore: fix flakey e2e tests"}

[kmendell]

• chore: fix flakey e2e tests #4145 👈 (View in Graphite)
• main

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
🔒 Security Review	✅ Completed 2026-09-21T20:57:57.851491Z	84ec79a	Draft marked ready

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[graphite-app]

Graphite Automations

"Warn authors when publishing large PRs" took an action on this PR • (09/21/26)

1 teammate was notified to this PR based on Kyle Mendell's automation.

[arcane-github-automation]

Container images for this PR have been built successfully!

• Manager: ghcr.io/getarcaneapp/manager:pr-4145
• Agent: ghcr.io/getarcaneapp/agent:pr-4145

Built from commit 84ec79a