- Add stopProviderFallback manifest field with backward compat for skipBuiltInFallback
- Expose stop_provider_fallback in extension JSON API
- Unify service and search provider chips into 4-per-row grid layout
- Enable Ask Before Download for extensions with quality options
- Force useExtensionProviders always-on (built-in providers retired)
- Update localization: Built-in -> Legacy, remove obsolete description text
- Clear hardcoded donor names list
- Bind cancel context to all extension HTTP calls (fetch, httpGet, httpPost,
httpRequest, fileDownload, authExchangeCodeWithPKCE) so in-flight requests
are aborted when user cancels a download
- Make initDownloadCancel idempotent: return existing context if entry already
exists and preserve pre-cancelled state
- Force SAF output filename to match actual file extension when extension
returns a different format than requested (e.g. FLAC requested but M4A produced)
- Map ALAC/AAC quality to .m4a instead of falling through to default .flac
- Add extension manager, manifest, runtime, providers, settings
- Add extension provider and UI pages (extensions, detail, priority)
- Add download service picker widget
- Add metadata provider priority page
- Add source field to Track model for extension tracking
- Add skipBuiltInFallback manifest option to skip built-in providers
- Update download queue to use source extension first
- Add extension upgrade support without data loss