fix: make ChatUI model selection theme-aware

[wcqqq1214]

Summary

• replace the hard-coded selected-model background with a Vuetify theme color
• remove the ineffective generic dark-theme override
• keep the change scoped to the ChatUI provider model menu

Root cause

The selected model item used the fixed light color #f2f2f2. The fallback dark-mode selector targeted .v-theme--dark, while AstrBot uses named Vuetify themes such as v-theme--PurpleThemeDark, so the light background remained visible with white text in dark mode.

Impact

The compiled selector remains scoped to ProviderModelMenu.vue and only changes the active item background. Provider data, API calls, selection behavior, hover styles, and other list components are unchanged.

Validation

• cd dashboard && pnpm build
• uv run ruff format .
• uv run ruff check .
• verified the selected item in the running ChatUI under both light and dark themes
• confirmed computed backgrounds resolve from each theme's --v-theme-primary value

Fixes #9193

Summary by Sourcery

Make the ChatUI provider model selection background use Vuetify theme colors for better light/dark theme support.

Enhancements:

• Use the Vuetify primary theme color for the active provider model menu item background instead of a hard-coded light color.
• Remove the obsolete dark-theme-specific background override for active provider model menu items to rely on theme-derived styling.

[gemini-code-assist]

Code Review

This pull request updates the active background color of the provider menu item in ProviderModelMenu.vue to use a theme-based primary color with opacity. This change allows for the removal of the dark-theme-specific override, simplifying the stylesheet. There are no review comments to address.

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[sourcery-ai]

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