[Fectivnfy112357]

Change

Fix two cross-platform test failures introduced by #36 without changing product behavior.

• Compare the external file reference's workspace directory with toPosixPath(artifacts), matching the preview state's normalized path contract on Windows.
• Read the Settings and Usage menu centers once, then move the mouse directly during the repeated hover loop. Locator stability waits must not turn a rapid hover scenario into a legitimate 180ms fly-out close and subsequent quota refresh.

The quota request count, subscription-label stability, and close/reopen refresh assertions remain unchanged. No screenshot baselines or first-frame timeout budgets are changed.

Validation

• External absolute reference integration case: 1 passed on Linux; exercises real file reading, authenticated image bytes, Range requests, and missing-token rejection.
• Subscription hover case: light and dark themes, each repeated three times; 6 passed on Linux.
• pnpm build:webui and git diff --check: passed.
• Performance: basic; test-only change.
• NOT RUN: Windows/macOS execution and full repository verification. Platform CI must confirm the affected runner behavior.

Publication and contribution checks

• Changes use existing applicable licenses; no imported material.
• No credentials, account data, real user content, or private review material.
• No new files or test suites; no source inventory regeneration needed.
• No product behavior or documentation contract changes; fixture evidence is not live-service acceptance.

Maintainer handoff

Publication scope and license changes: none. Shared-source port: not needed; WebUI tests only.