feat: add saved presets for common stacks

[z8dn]

Summary

Implements #30 — predefined file groups for common project stacks.

Adds a Load Preset action to the Custom File Groups toolbar in the Advanced Android Project Tree settings. Selecting it shows a two-step popup:

1. Choose a preset — Standard Android, Kotlin Multiplatform, or Compose Multiplatform.
2. Choose how to apply it:
   • Append — add the preset's groups, skipping any whose name already exists (case-insensitive).
   • Overwrite — replace the patterns of existing groups with the same name, append the rest.
   • Replace all — discard existing groups and use only the preset's groups.

Loaded groups are ordinary ProjectFileGroups and remain fully editable through the existing Edit dialog.

Presets

Preset	Groups
Standard Android	Gradle Scripts, Android Config, Documentation
Kotlin Multiplatform	Gradle Scripts, Native Configs, Platform Metadata
Compose Multiplatform	Compose Config, Compose Resources

Changes

• New settings/FileGroupPresets.kt — FileGroupPreset data class, PresetMergeMode enum, the built-in presets, and a non-mutating merge() helper.
• settings/AndroidViewSettingsConfigurable.kt — wires the Load Preset extra action into the existing ToolbarDecorator; reuses the established apply/reset flow (no persistence changes).
• messages/AndroidViewBundle.properties — new UI / preset strings.
• New FileGroupPresetsTest.kt — covers preset structure (non-empty, valid names + inclusion patterns, unique names) and all three merge modes including source-list immutability.

Testing

⚠️ The build/test could not be run in this environment — the IntelliJ Platform Gradle Plugin cannot download the Android Studio platform dependency (2026.1.1.1) under the current network policy, and it is not cached. The logic in FileGroupPresets.merge() is covered by unit tests that should be run locally via ./gradlew test.

Closes #30

https://claude.ai/code/session_01RJzGpHgrEkpuhg1AzE7M2J

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