feat: Add screen color picker and update dependencies (close #4)

This commit introduces a screen color picker in the settings and updates several dependencies.

Key changes:
- **Screen Color Picker**:
    - Added a color picker dialog to `SettingsFragment` allowing users to select the screen light color.
    - The selected color is saved in preferences and used for the screen light in `MainActivity`.
    - Added `editTextScreenColor` to `fragment_settings.xml` for displaying and selecting the screen color.
    - Updated `SettingsViewModel` to include `screenColor` LiveData.
    - Updated `Misc.kt` to handle color hex string to color integer conversion and validation.
    - Updated `SOSFlashlightApp` to store `defaultScreenColor`.
    - Updated `PreferenceKeyConst.kt` and `PreferenceValueConst.kt` with constants for screen color.
- **Dependency Updates**:
    - Added `colorpicker-compose`, `androidx.ui.android`, and `androidx.foundation.android` dependencies.
    - Updated `agp`, `foundationAndroid`, `fragmentKtx`, `kotlin`, `coreKtx`, `appcompat`, `material`, `constraintlayout`, `navigationFragmentKtx`, `navigationUiKtx`, `lifecycleViewmodelAndroid`, and `uiAndroid` versions in `gradle/libs.versions.toml`.
    - Enabled Compose in `app/build.gradle.kts`.
- **Testing**:
    - Added `MiscTest.kt` with tests for color conversion.
    - Updated `ExampleInstrumentedTest.kt` package name.
- **IDE Configuration**:
    - Removed various `.idea` configuration files.

Author: WeilJimmer