feat(theme): add CSS injection pipeline, presets, rewrite ThemeProvider, FOUC prevention

dashboard/src/lib/theme-context.ts

@@ -1,15 +1,30 @@
 import { createContext } from 'react'
 
+import type { UserThemeConfig } from './theme/tokens'
+
 type Theme = 'dark' | 'light' | 'system'
 
 export type ThemeProviderState = {
   theme: Theme
+  resolvedTheme: 'dark' | 'light'
   setTheme: (theme: Theme) => void
+  themeConfig: UserThemeConfig
+  updateThemeConfig: (partial: Partial<UserThemeConfig>) => void
+  resetTheme: () => void
 }
 
 const initialState: ThemeProviderState = {
   theme: 'system',
+  resolvedTheme: 'light',
   setTheme: () => null,
+  themeConfig: {
+    selectedPreset: 'light',
+    accentColor: '',
+    tokenOverrides: {},
+    customCSS: '',
+  },
+  updateThemeConfig: () => null,
+  resetTheme: () => null,
 }
 
 export const ThemeProviderContext = createContext<ThemeProviderState>(initialState)