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Implements the frontend state management layer using Zustand. Each store is single-purpose and testable in isolation. Focus Store (focus-store.ts): - Tracks current focused item (THE ONE THING) - Manages the queue of remaining items - Actions: setItems, act (start/defer/skip), setFocus, reorderQueue - Advancing through items removes from queue, promotes next to current Navigation Store (nav-store.ts): - Simple view routing: focus | queue | inbox - No URL-based routing needed for native app - Default view is "focus" Capture Store (capture-store.ts): - Manages quick capture overlay state - Tracks submission status and errors - Opens via global shortcut event listener Batch Store (batch-store.ts): - Manages batch processing mode for rapid item completion - Tracks items, their statuses (pending/done/skipped), and current index - Derives counts: completedCount, skippedCount, isFinished - Used for "knock out all code reviews" workflow State design principles: - No derived state stored; computed on access - Actions are pure mutations with logging - Loading/error states colocated with data Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>