Default theme to Sage (consumer) for all new users

- resolveStoredTheme() falls back to 'consumer' instead of 'dark'
- ThemeContext default also updated to 'consumer'
- Users with a previously saved theme are unaffected (localStorage wins)

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

src/theme/context.ts

@@ -15,7 +15,7 @@ export interface ThemeContextValue {
 }
 
 export const ThemeContext = createContext<ThemeContextValue>({
-  theme: 'dark',
+  theme: 'consumer',
   toggleTheme: () => { },
   toggleWithTransition: () => { },
   setTheme: () => { },

src/theme/index.tsx

@@ -6,9 +6,9 @@ function resolveStoredTheme(): Theme {
     const stored = localStorage.getItem('nbl-theme')
     const valid: Theme[] = ['light', 'warm', 'dim', 'dark', 'terra', 'dusk', 'slate', 'consumer']
     if (valid.includes(stored as Theme)) return stored as Theme
-    // Migrate any unrecognised or old values to dark (Agos — the primary theme)
+    // Migrate any unrecognised or old values to consumer (Sage — the default)
   } catch { /* ignore */ }
-  return 'dark'
+  return 'consumer'
 }
 
 function applyTheme(t: Theme) {