chore: upgrade to agp 9.0

[Manabu-GT]

Summary by CodeRabbit

• Chores
  • Updated Gradle to version 9.3.1 and Android Gradle Plugin to version 9.0.0.
  • Updated build configuration settings for compatibility with latest build system versions.

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📝 Walkthrough

Walkthrough

The pull request updates the project's build system for AGP 9 compatibility. AGP version is upgraded from 8.13.2 to 9.0.0, Gradle distribution from 8.14.4 to 9.3.1, and two new compatibility flags are added to gradle.properties.

Changes

Cohort / File(s)	Summary
Gradle Configuration gradle.properties, gradle/libs.versions.toml, gradle/wrapper/gradle-wrapper.properties	Updated build versions: AGP 8.13.2→9.0.0, Gradle 8.14.4→9.3.1. Added android.builtInKotlin=false and android.newDsl=false properties for AGP 9 migration.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'chore: upgrade to agp 9.0' clearly and concisely summarizes the main change: upgrading Android Gradle Plugin to version 9.0, which is reflected in all three modified files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into main

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/agp-update

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@gradle.properties`:
- Around line 11-12: Remove the now-redundant property by deleting the lines
that set android.r8.optimizedResourceShrinking=true (and the accompanying
comment that it’s only needed before AGP 9.0.0), since AGP 9.0.0+ applies
optimized resource shrinking automatically when isShrinkResources = true; locate
the entry named android.r8.optimizedResourceShrinking in gradle.properties and
remove it.