Update FAQ, Home, and AirPod-Keys for CAPod 5.0+ AAP support
Android's upstream Bluetooth stack fix (CAPod issue #215 / Android issuetracker 371713238) has landed on Pixel devices on Android 16/17 builds as of April 2026. CAPod 5.0+ ships an AAP client that can change device settings (ANC, stem actions, noise control, etc.) and auto-retrieve IRK/encryption keys. This updates the wiki to reflect the new reality:
- FAQ.md: rewrite intro + ANC/EQ entry as canonical capability reference. Add model/firmware gating caveat, OEM rollout disclaimer, and AAP connection triage steps. Update auto-pause and battery entries to describe AAP as a supplement/fallback rather than treating it as impossible.
- Home.md: add a device settings bullet linking to the canonical FAQ entry; mention auto key retrieval in the accuracy section.
- AirPod-Keys.md: add a callout that CAPod 5.0+ usually retrieves keys automatically via AAP; manual extraction remains the fallback.
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