feature: Reorganize code into formats folder structure

Moved embroidery format-related code from utils to new formats folder:

Structure:
- src/formats/pen/ - PEN format encoding and parsing
  - encoder.ts (was utils/penEncoder.ts)
  - encoder.test.ts (was utils/penEncoder.test.ts)
  - parser.ts (was utils/penParser.ts)
  - PEN constants moved inline to encoder.ts

- src/formats/import/ - Pattern import/conversion (currently PES)
  - worker.ts (was workers/patternConverter.worker.ts)
  - client.ts (was utils/patternConverterClient.ts)
  - pesImporter.ts (was utils/pystitchConverter.ts)
  - pyodideLoader.ts (was utils/pyodideLoader.ts)
  - constants.ts (PyStitch/pyembroidery constants)

Benefits:
- Better separation of concerns
- PEN encoder is co-located with PEN parser
- Import logic is in one place and extensible for other formats
- Removed utils/embroideryConstants.ts - split into appropriate locations
- Updated all 18 import references across the codebase

All tests passing, build successful.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/components/FileUpload.tsx

@@ -3,7 +3,7 @@ import { useShallow } from 'zustand/react/shallow';
 import { useMachineStore } from '../stores/useMachineStore';
 import { usePatternStore } from '../stores/usePatternStore';
 import { useUIStore } from '../stores/useUIStore';
-import { convertPesToPen, type PesPatternData } from '../utils/pystitchConverter';
+import { convertPesToPen, type PesPatternData } from '../formats/import/pesImporter';
 import { canUploadPattern, getMachineStateCategory } from '../utils/machineStateHelpers';
 import { PatternInfoSkeleton } from './SkeletonLoader';
 import { ArrowUpTrayIcon, CheckCircleIcon, DocumentTextIcon, FolderOpenIcon } from '@heroicons/react/24/solid';

src/components/KonvaComponents.tsx

@@ -1,9 +1,9 @@
 import { memo, useMemo } from 'react';
 import { Group, Line, Rect, Text, Circle } from 'react-konva';
-import type { PesPatternData } from '../utils/pystitchConverter';
-import { getThreadColor } from '../utils/pystitchConverter';
+import type { PesPatternData } from '../formats/import/pesImporter';
+import { getThreadColor } from '../formats/import/pesImporter';
 import type { MachineInfo } from '../types/machine';
-import { MOVE } from '../utils/embroideryConstants';
+import { MOVE } from '../formats/import/constants';
 
 interface GridProps {
   gridSize: number;

src/components/PatternCanvas.tsx

@@ -5,7 +5,7 @@ import { usePatternStore } from '../stores/usePatternStore';
 import { Stage, Layer, Group } from 'react-konva';
 import Konva from 'konva';
 import { PlusIcon, MinusIcon, ArrowPathIcon, LockClosedIcon, PhotoIcon, ArrowsPointingInIcon } from '@heroicons/react/24/solid';
-import type { PesPatternData } from '../utils/pystitchConverter';
+import type { PesPatternData } from '../formats/import/pesImporter';
 import { calculateInitialScale } from '../utils/konvaRenderers';
 import { Grid, Origin, Hoop, Stitches, PatternBounds, CurrentPosition } from './KonvaComponents';
 

src/formats/import/client.ts

@@ -1,7 +1,7 @@
-import type { WorkerMessage, WorkerResponse } from '../workers/patternConverter.worker';
-import PatternConverterWorker from '../workers/patternConverter.worker?worker';
-import { parsePenData } from './penParser';
-import type { PenData } from '../types/machine';
+import type { WorkerMessage, WorkerResponse } from './worker';
+import PatternConverterWorker from './worker?worker';
+import { parsePenData } from '../pen/parser';
+import type { PenData } from '../../types/machine';
 
 export type PyodideState = 'not_loaded' | 'loading' | 'ready' | 'error';
 

src/formats/import/constants.ts

@@ -15,9 +15,3 @@ export const TRIM = 0x20;         // Trim thread command
 export const COLOR_CHANGE = 0x40; // Color change command
 export const STOP = 0x80;         // Stop command
 export const END = 0x100;         // End of pattern
-
-// PEN format flags for Brother machines
-export const PEN_FEED_DATA = 0x01; // Bit 0: Jump stitch (move without stitching)
-export const PEN_CUT_DATA = 0x02;  // Bit 1: Trim/cut thread command
-export const PEN_COLOR_END = 0x03; // Last stitch before color change
-export const PEN_DATA_END = 0x05;  // Last stitch of entire pattern

src/formats/import/pesImporter.ts

@@ -1,4 +1,4 @@
-import { patternConverterClient, type PesPatternData } from "./patternConverterClient";
+import { patternConverterClient, type PesPatternData } from "./client";
 
 // Re-export the type for backwards compatibility
 export type { PesPatternData };

src/formats/import/worker.ts

@@ -4,8 +4,8 @@ import {
   MOVE,
   TRIM,
   END,
-} from '../utils/embroideryConstants';
-import { encodeStitchesToPen } from '../utils/penEncoder';
+} from './constants';
+import { encodeStitchesToPen } from '../pen/encoder';
 
 // Message types from main thread
 export type WorkerMessage =

src/formats/pen/encoder.test.ts

@@ -4,8 +4,8 @@ import {
   calculateLockDirection,
   generateLockStitches,
   encodeStitchesToPen,
-} from './penEncoder';
-import { STITCH, MOVE, TRIM, END } from './embroideryConstants';
+} from './encoder';
+import { STITCH, MOVE, TRIM, END } from '../import/constants';
 
 // PEN format flag constants for testing
 const PEN_FEED_DATA = 0x01;

src/formats/pen/encoder.ts

@@ -5,15 +5,13 @@
  * The PEN format uses absolute coordinates shifted left by 3 bits, with flags in the low 3 bits.
  */
 
-import {
-  MOVE,
-  TRIM,
-  END,
-  PEN_FEED_DATA,
-  PEN_CUT_DATA,
-  PEN_COLOR_END,
-  PEN_DATA_END,
-} from './embroideryConstants';
+import { MOVE, TRIM, END } from '../import/constants';
+
+// PEN format flags for Brother machines
+const PEN_FEED_DATA = 0x01; // Bit 0: Jump stitch (move without stitching)
+const PEN_CUT_DATA = 0x02;  // Bit 1: Trim/cut thread command
+const PEN_COLOR_END = 0x03; // Last stitch before color change
+const PEN_DATA_END = 0x05;  // Last stitch of entire pattern
 
 // Constants from PesxToPen.cs
 const FEED_LENGTH = 50; // Long jump threshold requiring lock stitches and cut

src/formats/pen/parser.ts

@@ -1,4 +1,4 @@
-import type { PenData, PenStitch, PenColorBlock } from '../types/machine';
+import type { PenData, PenStitch, PenColorBlock } from '../../types/machine';
 
 // PEN format flags
 const PEN_FEED_DATA = 0x01; // Y-coordinate low byte, bit 0

src/hooks/useBrotherMachine.ts

@@ -11,7 +11,7 @@ import {
 } from "../services/PatternCacheService";
 import type { IStorageService } from "../platform/interfaces/IStorageService";
 import { createStorageService } from "../platform";
-import type { PesPatternData } from "../utils/pystitchConverter";
+import type { PesPatternData } from "../formats/import/pesImporter";
 import { SewingMachineError } from "../utils/errorCodeHelpers";
 
 export function useBrotherMachine() {

src/platform/browser/BrowserStorageService.ts

@@ -1,6 +1,6 @@
 import { PatternCacheService } from '../../services/PatternCacheService';
 import type { IStorageService, ICachedPattern } from '../interfaces/IStorageService';
-import type { PesPatternData } from '../../utils/pystitchConverter';
+import type { PesPatternData } from '../../formats/import/pesImporter';
 
 /**
  * Browser implementation of storage service using localStorage

src/platform/electron/ElectronStorageService.ts

@@ -1,5 +1,5 @@
 import type { IStorageService, ICachedPattern } from '../interfaces/IStorageService';
-import type { PesPatternData } from '../../utils/pystitchConverter';
+import type { PesPatternData } from '../../formats/import/pesImporter';
 
 /**
  * Electron implementation of storage service using electron-store via IPC

src/platform/interfaces/IStorageService.ts

@@ -1,4 +1,4 @@
-import type { PesPatternData } from '../../utils/pystitchConverter';
+import type { PesPatternData } from '../../formats/import/pesImporter';
 
 export interface ICachedPattern {
   uuid: string;

src/services/PatternCacheService.ts

@@ -1,4 +1,4 @@
-import type { PesPatternData } from '../utils/pystitchConverter';
+import type { PesPatternData } from '../formats/import/pesImporter';
 
 interface CachedPattern {
   uuid: string;

src/stores/useMachineStore.ts

@@ -10,7 +10,7 @@ import { SewingMachineError } from '../utils/errorCodeHelpers';
 import { uuidToString } from '../services/PatternCacheService';
 import { createStorageService } from '../platform';
 import type { IStorageService } from '../platform/interfaces/IStorageService';
-import type { PesPatternData } from '../utils/pystitchConverter';
+import type { PesPatternData } from '../formats/import/pesImporter';
 
 interface MachineState {
   // Service instances

src/stores/usePatternStore.ts

@@ -1,5 +1,5 @@
 import { create } from 'zustand';
-import type { PesPatternData } from '../utils/pystitchConverter';
+import type { PesPatternData } from '../formats/import/pesImporter';
 
 interface PatternState {
   // Pattern data

src/stores/useUIStore.ts

@@ -1,5 +1,5 @@
 import { create } from 'zustand';
-import { patternConverterClient } from '../utils/patternConverterClient';
+import { patternConverterClient } from '../formats/import/client';
 
 interface UIState {
   // Pyodide state

src/utils/konvaRenderers.ts

@@ -1,8 +1,8 @@
 import Konva from 'konva';
-import type { PesPatternData } from './pystitchConverter';
-import { getThreadColor } from './pystitchConverter';
+import type { PesPatternData } from '../formats/import/pesImporter';
+import { getThreadColor } from '../formats/import/pesImporter';
 import type { MachineInfo } from '../types/machine';
-import { MOVE } from './embroideryConstants';
+import { MOVE } from '../formats/import/constants';
 
 /**
  * Renders a grid with specified spacing