v0.7.1

Changed:
STT install now uses the same optional speech installer flow as TTS, with clearer progress, install status, model verification, and translated UI text.
Windows portable builds now bundle uv.exe for runtime optional package installs, including STT, Kokoro, and ElevenLabs.
STT and Kokoro installers now remove stale optional-package artifacts before repair installs.
Fixed:
Fixed STT installs appearing frozen or impossible to verify from Settings.
Fixed Setup Check reporting STT as healthy when faster-whisper existed but failed to import.
Fixed Windows portable builds failing when uv was missing or not discoverable after installation.
Fixed packaged runtime optional installs failing because uv.exe was not bundled.
Fixed broken STT/Kokoro rebuilds being reused instead of cleaned before reinstall.