Add Export/Import project buttons to Settings → Project. A bundle is a ZIP holding
the full .szg project plus every sample WAV it references (Sampler pads, SoundFont),
so unlike a plain .szg — whose sample ids only resolve on the originating device —
it opens complete on another Sizzletracker instance.
Export shares the bundle via the system share sheet. Import replaces the current
project, extracts the WAVs to a persistent content-addressed samples dir, re-points
each slot's padNFile/sfFile at the extracted file, then rehydrates — so the audio is
restored for the session and survives a restart. Invalid files are rejected cleanly.
Covered by ProjectBundleIoTest.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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