feat(quota): add zustand store for quota state caching

src/types/index.ts

@@ -12,3 +12,4 @@ export * from './authFile';
 export * from './oauth';
 export * from './usage';
 export * from './log';
+export * from './quota';

src/types/quota.ts

@@ -0,0 +1,49 @@
+/**
+ * Quota management types.
+ */
+
+export interface AntigravityQuotaGroup {
+  id: string;
+  label: string;
+  models: string[];
+  remainingFraction: number;
+  resetTime?: string;
+}
+
+export interface AntigravityQuotaState {
+  status: 'idle' | 'loading' | 'success' | 'error';
+  groups: AntigravityQuotaGroup[];
+  error?: string;
+  errorStatus?: number;
+}
+
+export interface GeminiCliQuotaBucketState {
+  id: string;
+  label: string;
+  remainingFraction: number | null;
+  remainingAmount: number | null;
+  resetTime: string | undefined;
+  tokenType: string | null;
+}
+
+export interface GeminiCliQuotaState {
+  status: 'idle' | 'loading' | 'success' | 'error';
+  buckets: GeminiCliQuotaBucketState[];
+  error?: string;
+  errorStatus?: number;
+}
+
+export interface CodexQuotaWindow {
+  id: string;
+  label: string;
+  usedPercent: number | null;
+  resetLabel: string;
+}
+
+export interface CodexQuotaState {
+  status: 'idle' | 'loading' | 'success' | 'error';
+  windows: CodexQuotaWindow[];
+  planType?: string | null;
+  error?: string;
+  errorStatus?: number;
+}