Refactor Gemini rate limiting configuration

- Removed billingEnabled setting and replaced it with rateLimitingEnabled in GeminiAgent.
- Updated enforceRateLimitForModel function to skip rate limiting based on rateLimitingEnabled.
- Adjusted getGeminiConfig to retrieve rateLimitingEnabled from settings.
- Changed settings management to reflect the new rate limiting logic in SettingsDefaultsManager and UI components.
- Updated ContextSettingsModal to toggle rate limiting instead of billing.
- Ensured default settings reflect the new rate limiting behavior for free tier users.

src/ui/viewer/components/ContextSettingsModal.tsx

@@ -481,11 +481,11 @@ export function ContextSettingsModal({
                   </FormField>
                   <div className="toggle-group" style={{ marginTop: '8px' }}>
                     <ToggleSwitch
-                      id="gemini-billing-enabled"
-                      label="Billing Enabled"
-                      description="Enable if you have billing set up on Google Cloud. Skips rate limiting (1000+ RPM available)."
-                      checked={formState.CLAUDE_MEM_GEMINI_BILLING_ENABLED === 'true'}
-                      onChange={(checked) => updateSetting('CLAUDE_MEM_GEMINI_BILLING_ENABLED', checked ? 'true' : 'false')}
+                      id="gemini-rate-limiting"
+                      label="Rate Limiting"
+                      description="Enable for free tier (10-30 RPM). Disable if you have billing set up (1000+ RPM)."
+                      checked={formState.CLAUDE_MEM_GEMINI_RATE_LIMITING_ENABLED === 'true'}
+                      onChange={(checked) => updateSetting('CLAUDE_MEM_GEMINI_RATE_LIMITING_ENABLED', checked ? 'true' : 'false')}
                     />
                   </div>
                 </>

src/ui/viewer/constants/settings.ts

@@ -12,7 +12,7 @@ export const DEFAULT_SETTINGS = {
   CLAUDE_MEM_PROVIDER: 'claude',
   CLAUDE_MEM_GEMINI_API_KEY: '',
   CLAUDE_MEM_GEMINI_MODEL: 'gemini-2.5-flash-lite',
-  CLAUDE_MEM_GEMINI_BILLING_ENABLED: 'false',
+  CLAUDE_MEM_GEMINI_RATE_LIMITING_ENABLED: 'true',
 
   // Token Economics (all true for backwards compatibility)
   CLAUDE_MEM_CONTEXT_SHOW_READ_TOKENS: 'true',

src/ui/viewer/types.ts

@@ -64,6 +64,7 @@ export interface Settings {
   CLAUDE_MEM_PROVIDER?: string;  // 'claude' | 'gemini'
   CLAUDE_MEM_GEMINI_API_KEY?: string;
   CLAUDE_MEM_GEMINI_MODEL?: string;  // 'gemini-2.5-flash-lite' | 'gemini-2.5-flash' | 'gemini-3-flash'
+  CLAUDE_MEM_GEMINI_RATE_LIMITING_ENABLED?: string;  // 'true' | 'false'
 
   // Token Economics Display
   CLAUDE_MEM_CONTEXT_SHOW_READ_TOKENS?: string;