Update design with expressive theme

[pawcoding]

Will be a draft until Material 3 Expressive is fully released (currently alpha)

[pawcoding]

@copilot resolve the merge conflicts in this pull request

[pawcoding]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Merge conflicts have been resolved. Here's a summary of how each conflict was handled:

• gradle/libs.versions.toml — adopted nav3, kotlin, kotlinSerialization, and lifecycle versions from staging; kept material3 = "1.5.0-alpha09" for the expressive theme
• Navigation.kt — deleted (staging replaced the old navigation-compose system with a new nav3-based Navigator)
• AddCardComponent.kt / CardComponent.kt — kept MaterialTheme.shapes.large (expressive theme shape tokens) over the hardcoded RoundedCornerShape(24.dp)
• EditCardForm.kt — kept AnimatedVisibility for the check icon (expressive animation)
• LabelsListComponent.kt — kept @OptIn(ExperimentalMaterial3ExpressiveApi::class) and added the FAVORITES_LABEL_ID sentinel constant from staging
• CardListScreen.kt — kept both the Arrangement import (ours) and the Toast import (staging's)