MAESTRO: Create ThemeProvider component for web interface

- Add src/web/components/ThemeProvider.tsx with React context for theming
- Provide useTheme and useThemeColors hooks for child components
- Include default theme (Dracula) for initial render before WebSocket connection
- Update tsconfig.json to include src/web and src/shared directories

src/web/components/ThemeProvider.tsx

@@ -0,0 +1,141 @@
+/**
+ * ThemeProvider component for Maestro web interface
+ *
+ * Provides theme context to web components. Accepts theme via props
+ * (typically received from WebSocket connection to desktop app).
+ */
+
+import React, { createContext, useContext, useMemo } from 'react';
+import type { Theme, ThemeColors } from '../../shared/theme-types';
+
+/**
+ * Context value containing the current theme and utility functions
+ */
+interface ThemeContextValue {
+  /** Current theme object */
+  theme: Theme;
+  /** Whether the theme is a light theme */
+  isLight: boolean;
+  /** Whether the theme is a dark theme */
+  isDark: boolean;
+  /** Whether the theme is a vibe theme */
+  isVibe: boolean;
+}
+
+/**
+ * Default theme used when no theme is provided
+ * Matches the Dracula theme from the desktop app
+ */
+const defaultTheme: Theme = {
+  id: 'dracula',
+  name: 'Dracula',
+  mode: 'dark',
+  colors: {
+    bgMain: '#0b0b0d',
+    bgSidebar: '#111113',
+    bgActivity: '#1c1c1f',
+    border: '#27272a',
+    textMain: '#e4e4e7',
+    textDim: '#a1a1aa',
+    accent: '#6366f1',
+    accentDim: 'rgba(99, 102, 241, 0.2)',
+    accentText: '#a5b4fc',
+    success: '#22c55e',
+    warning: '#eab308',
+    error: '#ef4444',
+  },
+};
+
+const ThemeContext = createContext<ThemeContextValue | null>(null);
+
+export interface ThemeProviderProps {
+  /** Theme object to provide to children. If not provided, uses default theme. */
+  theme?: Theme;
+  /** Children components that will have access to the theme */
+  children: React.ReactNode;
+}
+
+/**
+ * ThemeProvider component that provides theme context to the component tree
+ *
+ * @example
+ * ```tsx
+ * // With theme from WebSocket
+ * <ThemeProvider theme={themeFromServer}>
+ *   <App />
+ * </ThemeProvider>
+ *
+ * // Using the context in a child component
+ * const { theme, isDark } = useTheme();
+ * ```
+ */
+export function ThemeProvider({ theme = defaultTheme, children }: ThemeProviderProps) {
+  const contextValue = useMemo<ThemeContextValue>(
+    () => ({
+      theme,
+      isLight: theme.mode === 'light',
+      isDark: theme.mode === 'dark',
+      isVibe: theme.mode === 'vibe',
+    }),
+    [theme]
+  );
+
+  return (
+    <ThemeContext.Provider value={contextValue}>
+      {children}
+    </ThemeContext.Provider>
+  );
+}
+
+/**
+ * Hook to access the current theme context
+ *
+ * @throws Error if used outside of a ThemeProvider
+ *
+ * @example
+ * ```tsx
+ * function MyComponent() {
+ *   const { theme, isDark } = useTheme();
+ *   return (
+ *     <div style={{ backgroundColor: theme.colors.bgMain }}>
+ *       {isDark ? 'Dark mode' : 'Light mode'}
+ *     </div>
+ *   );
+ * }
+ * ```
+ */
+export function useTheme(): ThemeContextValue {
+  const context = useContext(ThemeContext);
+  if (!context) {
+    throw new Error('useTheme must be used within a ThemeProvider');
+  }
+  return context;
+}
+
+/**
+ * Hook to access just the theme colors for convenience
+ *
+ * @throws Error if used outside of a ThemeProvider
+ *
+ * @example
+ * ```tsx
+ * function Button() {
+ *   const colors = useThemeColors();
+ *   return (
+ *     <button style={{
+ *       backgroundColor: colors.accent,
+ *       color: colors.accentText
+ *     }}>
+ *       Click me
+ *     </button>
+ *   );
+ * }
+ * ```
+ */
+export function useThemeColors(): ThemeColors {
+  const { theme } = useTheme();
+  return theme.colors;
+}
+
+export { ThemeContext };
+export type { ThemeContextValue };

src/web/components/index.ts

@@ -0,0 +1,13 @@
+/**
+ * Web interface components for Maestro
+ *
+ * Shared components used by both mobile and desktop web interfaces.
+ */
+
+export {
+  ThemeProvider,
+  useTheme,
+  useThemeColors,
+  ThemeContext,
+} from './ThemeProvider';
+export type { ThemeProviderProps, ThemeContextValue } from './ThemeProvider';

src/web/index.ts

@@ -0,0 +1,9 @@
+/**
+ * Maestro Web Interface
+ *
+ * This module contains shared components, hooks, and utilities
+ * for the Maestro web interface (both mobile and desktop web).
+ */
+
+// Components
+export * from './components';

tsconfig.json

@@ -15,5 +15,5 @@
     "noUnusedParameters": true,
     "noFallthroughCasesInSwitch": true
   },
-  "include": ["src/renderer"]
+  "include": ["src/renderer", "src/web", "src/shared"]
 }