fix: respect microphone detection disabled setting for prolonged usage notifications

[devin-ai-integration]

Summary

When "Microphone detection" is toggled OFF in notification settings, micStarted notifications are correctly suppressed (line 78 check), but micProlongedUsage notifications ("Meeting in progress? Mic used for X minutes.") continued to fire because they only checked the separate notification_in_meeting_reminder setting.

This adds the missing notificationDetectEnabledRef.current guard to the micProlongedUsage handler, matching the existing pattern used for micStarted.

Reported by a user with an always-hot XLR mic who disabled "Microphone detection" but kept receiving detection notifications.

Review & Testing Checklist for Human

• Verify that micProlongedUsage is logically a child feature of "Microphone detection" and should be suppressed when that toggle is OFF — i.e., there's no valid use case where a user wants prolonged-usage reminders but not mic-started detection
• Test with "Microphone detection" OFF: confirm no prolonged usage notifications appear after ~3 minutes of mic activity
• Test with "Microphone detection" ON and "In-meeting reminder" OFF: confirm prolonged usage notifications are still suppressed (existing behavior, unchanged)
• Test with both ON: confirm prolonged usage notifications still work as expected

Notes

• The Rust-side detector continues to run and emit events even when detection is disabled; the frontend simply ignores them. This is consistent with the existing micStarted pattern but could be optimized separately.
• Link to Devin run
• Requested by @ComputelessComputer

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[devin-ai-integration]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 3 additional findings.