fix: align model picker with WhisperKit Apple Silicon support

[jatinkrmalik]

Summary

• replace the old size-ladder model picker with a Mac-focused WhisperKit variant catalog
• keep Medium as a legacy value but remove it from the normal Apple Silicon picker unless WhisperKit explicitly supports it
• map recommended and loaded models by exact WhisperKit variant name so Large v3, latest, turbo, compact, and distil variants do not collapse into one bucket
• reject incomplete CoreML model caches that are missing weights, so skeleton folders like the broken Medium cache are not treated as downloaded
• keep the earlier recovery behavior: model-load failures are visible in Settings and the previous working model is restored when possible

Why

On M-series Macs, WhisperKit does not expose a monotonic Tiny/Base/Small/Medium/Large ladder. Its support table can omit Medium while supporting modern Large v3 variants. The app should follow that exact catalog instead of encouraging users toward an unsupported Medium artifact.

Tests

• swift build
• git diff --check
• swift test --filter "SystemInfoTests|ModelSizeTests|ModelManagerTests|WhisperModelInfoTests"
• swift test --filter AppState
• swift test (196 tests, 1 skipped, 0 failures)

[jatinkrmalik]

/build

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DMG	VocaMac-0.5.0-pr.161+4180b0a-arm64.dmg
Size	6.0M
Branch	jmalik/fix/large-model-load-anyway
Commit	4180b0a
Signed	✅ Developer ID
Notarized	✅ Apple

📥 Install

1. Click the DMG link above to download
2. Open the DMG and drag VocaMac to Applications (replace existing)
3. Open VocaMac — No Gatekeeper warnings, no permission resets

SHA-256 checksum

d993be00e49fcb0b177fd4a92e183138d8b21b4efe163e03dc50657567259c91  VocaMac-0.5.0-pr.161+4180b0a-arm64.dmg

💡 Comment /build or /build-quick to rebuild.

[jatinkrmalik]

/build

[github-actions]

⏳ PR Build started for 4180b0a

Build signed & notarized DMG... this usually takes 10–20 minutes.

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[github-actions]

✅ PR Build ready!

DMG	VocaMac-0.6.2-pr.161+4180b0a-arm64.dmg
Size	6.0M
Branch	jmalik/fix/large-model-load-anyway
Commit	4180b0a
Signed	✅ Developer ID
Notarized	✅ Apple

📥 Install

1. Click the DMG link above to download
2. Open the DMG and drag VocaMac to Applications (replace existing)
3. Open VocaMac — No Gatekeeper warnings, no permission resets

SHA-256 checksum

b240d25589f2ee794ae7b64b99c0f50aadd2ec6428c1b81841be96d12287311b  VocaMac-0.6.2-pr.161+4180b0a-arm64.dmg

💡 Comment /build or /build-quick to rebuild.