Docs: a photo library app, the same words everywhere

[kellylford]

Following Kelly (14 Oct, "just say a photo library app"): the README, user guide, PRIVACY.md and v0.2.0 release notes say "screen-reader-friendly photo library app" instead of "photo browser", matching the repository's description and CLAUDE.md. Also, from the pre-release consistency review:

• User guide: the Description panel never downloads a photo that's only in the cloud (iCloud, OneDrive or another cloud folder), not only iCloud or OneDrive.
• PLATFORM-DIFFERENCES:
  • The accessibility-fields entry (Both: write descriptions to the standard accessibility metadata fields (IPTC Alt Text, Extended Description) #31) moves from "On Windows, from the Mac" to "Now the same on both"; its text already says both write the fields.
  • The test counts are up to date (Mac about 430, Windows about 300).
• Version example: "Check for Updates (running 0.2.0)" in PLATFORM-DIFFERENCES and windows/README.

Docs only.

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