Unwrap OverrideSettingsDesign

[Goooler]

Refs #119.

[Copilot]

Pull request overview

This PR continues the “Design → @Composable + ViewModel” split (refs #119) by removing the remaining OverrideSettingsDesign wrapper and moving override settings to a pure Compose screen backed by a dedicated OverrideSettingsViewModel.

Changes:

• Replace OverrideSettingsDesign/DesignActivity flow with OverrideSettingsScreen + OverrideSettingsViewModel and a simple BaseActivity host.
• Remove MutableState-based settings preference helpers/overloads in favor of explicit value/onValueChange APIs.
• Align MetaFeature settings naming (uiState → configuration) to match the override/settings pattern.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
app/src/main/kotlin/com/github/kr328/clash/ui/component/SettingsPreference.kt	Removes MutableState-based helpers/overloads; keeps a single value/onValueChange API surface for preferences.
app/src/main/kotlin/com/github/kr328/clash/settings/vm/OverrideSettingsViewModel.kt	Introduces a ViewModel that owns ConfigurationOverride state and implements update actions + persist/reset operations.
app/src/main/kotlin/com/github/kr328/clash/settings/vm/MetaFeatureSettingsViewModel.kt	Renames exposed state from uiState to configuration and updates action methods accordingly.
app/src/main/kotlin/com/github/kr328/clash/settings/ui/OverrideSettingsScreen.kt	Replaces the old Design wrapper with a Compose screen/content split wired to the new ViewModel and actions interface.
app/src/main/kotlin/com/github/kr328/clash/settings/ui/MetaFeatureSettingsScreen.kt	Updates callsites to use configuration and the renamed values parameter in list preference components.
app/src/main/kotlin/com/github/kr328/clash/settings/OverrideSettingsActivity.kt	Migrates activity from DesignActivity to BaseActivity and hosts the Compose screen via setContent.

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