Harden Lock Monitor errors, pause idle re-renders, accessibility, CI check

[umang350]

Summary

• Reliability: a crash in the Lock Monitor loop is now reported to the panel (it used to vanish); a failed model-key save is logged; the panel refuses a delete request whose rows aren't a list of objects (the engine still re-matches every row).
• Performance: the 30s re-renders in the panel and Summary are skipped while hidden and catch up on visibilitychange.
• Accessibility: visible :focus-visible outlines; under prefers-reduced-motion animations slow down rather than stop (so progress still reads as running); Left/Right/Home/End and roving tabindex on the tab bars; aria-live="polite" on the progress list.
• CI: new check.yml validates the manifest, node --checks every script, and runs package.sh (which now fails on unlisted top-level files).
• CHANGELOG updated.

Testing

• node --check on every script and sh package.sh pass locally.
• Not tested in a browser: keyboard navigation and focus styling, and the Lock Monitor / delete flows (they need a live Anaplan tenant). Worth a quick manual look at the tab bars.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Gp4Gxzr9KGd731nQ6UTixL

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