fix(android): apply CodeRabbit review on pure-ML Kit QR scanner

[Chloemlla]

Summary

Applies the actionable CodeRabbit comments from #3 to QrScannerView.kt:

• Restrict to QR format — build the ML Kit client with BarcodeScannerOptions.Builder().setBarcodeFormats(Barcode.FORMAT_QR_CODE). Faster, matches the PiliPlus decoder/activity behavior.
• Full teardown — a disposed flag guards the async cameraProviderFuture listener so binding never happens after disposal; onDispose now clears the analyzer, unbinds CameraX, closes the scanner and shuts down the analysis executor (previously only the executor was shut down).
• Close on synchronous throw — InputImage.fromMediaImage / scanner.process are wrapped so an exception still closes the ImageProxy instead of leaking it.

Note on release verification (CodeRabbit #1)

No device available in this environment. Unit tests + lint + release APK already pass on the merged head (ac8da0a, run 31609960628 exit 0); a real-device camera smoke test remains a manual step.

Test plan

• PiliPlus uses the identical scanner/teardown pattern and its release APK build passes.
• CI on this PR runs flutter analyze and the release APK build.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 1e09e893-98b9-463d-97b2-d3bececed222

📥 Commits

Reviewing files that changed from the base of the PR and between ac8da0a and 3cab3d5.

📒 Files selected for processing (1)

• android/app/src/main/java/com/chloemlla/synapse/mobile/ui/QrScannerView.kt

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