Decor Sounds 0.7.1 beta

- Fix: local room sounds and zones no longer fall back to your own settings while visiting someone else's house.
- Local playback requires confirmed ownership and a current house identity. Explicitly installed visitor packs remain supported.
- Visiting no longer overwrites your room-to-house mappings. Visiting a room in your own house refreshes its mapping.
- Room and zone editors hide your local settings while visiting and prevent saving changes there.
- Audio context resets when ownership or house identity changes, including transitions with identical room IDs.
- Added Studio & Help at the bottom of the main window, plus /dsounds studio and /dsounds help.
- Help explains the free Windows companion, optional bundled-sound use, installation, My Library and copyable website/download addresses.

Upgrade: Close WoW and merge DecorSounds into your existing AddOns folder.
Keep Sounds/User and the separate DecorSoundsLibrary folder. Do not delete SavedVariables.
Studio 0.7.0 remains compatible; no Studio rebuild is required.

Checks: Lua 5.1 compilation and mocked workflow/regression tests passed, including colliding visitor room IDs, ownership/identity failures, visitor packs and returning home. Real WoW gameplay still requires testing.
