Fix: Scope quick and debounced refresh to Keymaster lock entries

[tykeal]

Part of #670

Summary

Replace global quick/debounce refresh state with entry-specific tracking that feeds
the manager refresh pipeline. Rapid edits should coalesce per lock, while edits on different locks
refresh independently. This completes the releasable unit started by task-9.

Scope / changes

• Replace global _quick_refresh and _cancel_quick_refresh at coordinator.py:118-119, plus
  shutdown cleanup at coordinator.py:139-145, with per-entry sets/maps.
• Convert _trigger_quick_refresh() and debounce methods at coordinator.py:1834-1857 to accept
  entry IDs and call the manager pipeline/per-lock coordinator refresh.
• Convert all _quick_refresh = True sites to record entry IDs: coordinator.py:1596,
  coordinator.py:1678, coordinator.py:2310, and parent-child retry at
  coordinator.py:2493.
• Convert _schedule_quick_refresh_if_needed() at coordinator.py:2511-2522 to schedule only
  pending entry IDs.
• Keep entity setters calling await self.coordinator.async_request_debounced_refresh() through
  per-lock coordinator proxies; current setter examples include switch.py:324 and
  switch.py:352.
• Extend tests/test_debounce.py, which currently mocks _quick_refresh at
  tests/test_debounce.py:53-63, for per-entry quick/debounce behavior.

Plan reference

§5.7, §7.2, §7.5, §8 PR 5; decisions 3 and 9;
2026-07-07 task-9/task-10 shippability finding.

Dependencies

Depends on: #683

Acceptance criteria

• Multiple rapid edits for one lock coalesce into one per-lock refresh.
• Edits on two locks schedule two independent per-lock refreshes, not one global fan-out.
• set_pin_on_lock() and clear_pin_from_lock() add only target/transaction-affected entry IDs
  to quick-refresh tracking.
• Unload/shutdown cancels and removes per-entry quick/debounce handles.
• Re-run the plan §7.2 guard regression for quick/debounce paths and prove fan-out remains
  deferred and scoped to the dirty entry set.
• Targeted validation: pytest tests/test_debounce.py tests/test_coordinator_sync.py.
• Broader validation: ruff check custom_components/ tests/, ruff format --check custom_components/ tests/, mypy custom_components/keymaster/.

Risk / notes

Avoid reintroducing independent simultaneous polling. All scheduled quick
refreshes should pass through the manager's single sequential refresh loop from task-8.

Size

M