Discontinue support for Material icon pack

[egorikftp]

• closes: [IntelliJ] Discontinue support for the Material icon pack [rollback] #850

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• CLI changelog "Unreleased" section has been updated, if applicable.
• Gradle Plugin changelog "Unreleased" section has been updated, if applicable.
• IntelliJ Plugin changelog "Unreleased" section has been updated, if applicable.

[coderabbitai]

Walkthrough

This pull request removes support for the Material icon pack from the Valkyrie IDE plugin. The changes include deletion of the ExpandedGroup composable component, removal of the useMaterialPack state property from ValkyrieState and related settings classes, elimination of the UseMaterialPack action class, removal of Material pack UI options from the new pack creation screen, simplification of the icon pack input state construction, and deletion of associated localization strings. Additionally, the allowAddNestedPack parameter is removed from the NestedPacks composable function and related state classes.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Discontinue support for Material icon pack' directly and clearly describes the main objective of the pull request.
Description check	✅ Passed	The PR description follows the template with the linked issue referenced (#850) and changelog checkboxes appropriately marked.
Linked Issues check	✅ Passed	The pull request successfully implements issue #850 by removing Material icon pack support throughout the codebase.
Out of Scope Changes check	✅ Passed	All changes are directly related to removing Material icon pack support, with no out-of-scope modifications detected.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/Discontinue-support-for-the-Material-icon-pack

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In
`@tools/idea-plugin/src/main/kotlin/io/github/composegears/valkyrie/ui/screen/mode/iconpack/newpack/ui/viewmodel/NewPackInputHandler.kt`:
- Around line 19-25: The packageName InputState is created without setting
isValid, so pre-populated values from PackageExtractor.getFrom(...) leave
InputFieldState.packageName.isValid=false and the UI disables the Next button;
update the initialization in NewPackInputHandler (where InputFieldState is
constructed) to set packageName.isValid based on your package-name validation
(i.e., mark true when PackageExtractor.getFrom(...) yields a non-empty, valid
package) or alternatively call the validation routine in BasicInputHandler
during initialization to invoke onValidationChange for the pre-filled
packageName so the field state and UI are reconciled before the first UI
observation.