v0.3.0

Minor Changes

• 7f28696: Add the remaining Built-in AI task APIs: useSummarizer/createSummarizer, useWriter/createWriter, and useLanguageDetector/createLanguageDetector. Summarizer and Writer expose the same summarize/write + streaming + measureInput/inputQuota surface as the existing hooks; useLanguageDetector.detect resolves with the browser's ranked LanguageDetectionResult[] and has no streaming variant. isSupported and useGlobalDownloadProgress now accept the three new namespace names.
• 7f28696: useGlobalDownloadProgress now returns number | null — null when nothing is downloading, instead of 0. This lets callers distinguish "no download in flight" from "download just started at 0%". Update guards from progress === 0 to progress === null.