menubar: status-item recovery pulses all fire when the menu bar is persistent

[iamtoruk]

Found while diagnosing #1148. The recovery loop from #1161 that re-places a parked status item only worked when the menu bar auto-hides. On a persistent menu bar the reveal check is always true, so the hide gate never cleared: one pulse fired, retries two and three never ran, and the loop woke every 250ms for the rest of its two-minute window, about 477 no-op wakeups per launch.

Now the gate arms only when the menu bar can actually hide. Persistent bar: three pulses about 800ms apart, loop ends at about 2.4s. Auto-hide bar: unchanged.

• Two new tests; the persistent-bar test fails with the gate reverted.
• swift build clean, swift test 671 passing, localization coverage green, no strings changed.
• Independently reviewed: the only semantic change is the one gate line, the rest is extraction.

Does not by itself close #1148, whose remaining cause is system-side status-item state; the reporter has been asked for the two diagnostics.