feat: fix calorie tracking, integrate quick plan and add Play Store release support

[DecodeX15]

PR Description:

Addressed Issues:

Fixes #(issue number) - N/A

Screenshots/Recordings:

Additional Notes:

This PR bundles several critical bug fixes for session tracking and adds the necessary configurations for our initial Google Play
Store release.

1. Calorie Tracking System:

• Implemented the complete logic for tracking estimated calories burned based on exercise duration, MET values, and user weight.
• Integrated the fl_chart package to render a beautiful and interactive weekly calorie tracking graph on the Stats Screen.

2. Quick Plans Architecture:

• Introduced a complete MVVM architecture for curated Quick Plans .
• Updated the existing session schema and created dedicated tables for managing these plans.
• Users can now explore and start predefined workouts (e.g., "Fat Burner", "Core Strength").

3. Play Store Publishing & AppBundle Support:

• Updated the Android build configurations (build.gradle.kts) to support production keystore signing, and successfully generated the .aab file for the Google Play Store upload.

4. UI Enhancements:

• Fixed a visual bug where a black area appeared at the bottom of non-scrollable screens by enforcing double.infinity height on the AppScaffold background container.

Checklist

• My code follows the project's code style and conventions
• I have made corresponding changes to the documentation
• My changes generate no new warnings or errors
• I have joined the Discord server and I will share a link to this PR with the project
  maintainers there
• I have read the Contributing Guidelines

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