feat: enable r8 minification

[RohitKushvaha01]

Closes #2889

Note: after r8 is enabled every release must be tested for ClassNotFoundException and every new library/java class must be registered in proguard rules files

[greptile-apps]

Confidence Score: 4/5

The PR appears safe to merge, with the non-blocking concern that release-only minification behavior lacks automated validation.

Findings

1.  Release Minification Lacks Coverage ▶

Summary

• Copies the Gradle and ProGuard configuration into Cordova’s Android app module.
• Preserves application-owned reflection paths identified in Cordova plugins.
• Would benefit from automated minified-release coverage to catch future retention gaps.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Cordova prepare] --> B[Copy build-extras.gradle]
  A --> C[Copy proguard-rules.pro]
  B --> D[Android release build]
  C --> D
  D --> E[R8 code optimization]
  D --> F[Android resource shrinking]
  E --> G[Apply Cordova and reflection keep rules]
  G --> H[Release APK]
  F --> H

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