v0.8.0

Changed:
Added Live Voice conversation mode with audio worker support, provider configuration, and settings controls.
Added a Live Voice hotkey path, including toggle/press-to-talk handling.
Added interleaved conversation captions in the overlay bubble.
Added optional google-genai install support for Live Voice.
Improved optional dependency install flows with staged installs, restart/resume handling, progress/status UI, and safer package probing.
Improved Linux browser/context capture using AT-SPI2, X11 owner detection, removable context rows, and stale-selection chips.
Updated localized UI strings for Live Voice, installer states, and related settings.
Fixed:
Fixed optional TTS/STT installs deleting unrelated packages in the shared google/ namespace.
Fixed CUDA Torch installs being overwritten during Kokoro setup.
Fixed Torch probe timeouts and fallback status handling during Kokoro install checks.
Fixed Kokoro TTS warmup/synthesis trying to go online when it should stay offline.
Fixed Live Voice readiness hints and push-to-talk modifier handling.
Fixed staged optional installs not preserving the Settings-captured wait PID.
Fixed stale tests after installer, overlay, and settings flow changes.
Fixed Linux browser context focus/tab URL detection issues.
Fixed stale X11 PRIMARY selections being reused incorrectly.
Fixed UI host shutdown lock fatal errors.