feat: add dark theme support with CSS custom properties and Naive UI integration
Implement runtime theme switching using CSS custom properties delegated through SCSS variables, with light/dark/system modes, FOUC prevention, sidebar toggle, and settings selector. Add theme-aware video assets for sidebar and chat thinking indicator. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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<script setup lang="ts">
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import { useTheme } from '@/composables/useTheme'
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const { isDark, toggleTheme } = useTheme()
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</script>
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<template>
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<button class="theme-switch" :title="isDark ? 'Light mode' : 'Dark mode'" @click="toggleTheme">
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<!-- Sun icon (shown in dark mode) -->
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<svg v-if="isDark" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
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<circle cx="12" cy="12" r="5" />
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<line x1="12" y1="1" x2="12" y2="3" />
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<line x1="12" y1="21" x2="12" y2="23" />
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<line x1="4.22" y1="4.22" x2="5.64" y2="5.64" />
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<line x1="18.36" y1="18.36" x2="19.78" y2="19.78" />
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<line x1="1" y1="12" x2="3" y2="12" />
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<line x1="21" y1="12" x2="23" y2="12" />
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<line x1="4.22" y1="19.78" x2="5.64" y2="18.36" />
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<line x1="18.36" y1="5.64" x2="19.78" y2="4.22" />
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</svg>
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<!-- Moon icon (shown in light mode) -->
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<svg v-else width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
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<path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z" />
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</svg>
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</button>
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</template>
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<style scoped lang="scss">
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.theme-switch {
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display: flex;
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align-items: center;
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justify-content: center;
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width: 28px;
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height: 28px;
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border: none;
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background: transparent;
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border-radius: 4px;
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cursor: pointer;
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color: var(--text-muted);
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transition: color 0.15s ease, background-color 0.15s ease;
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&:hover {
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color: var(--text-primary);
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background: rgba(var(--accent-primary-rgb), 0.06);
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}
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}
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</style>
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