chore: remove dead code

[claude]

Removes dead code across web/, electron/, and mobile/. Each removal was verified with a repo-wide identifier search before deleting; npm run typecheck, npm run lint, and npm run test all pass.

web/eslint.config.mjs:67 turns @typescript-eslint/no-unused-vars off, so unused imports in web/ accumulate without any signal. That is where most of this came from.

Removed

Unused imports

File	Removed	Why
web/src/components/sketch/__tests__/transformCorrectness.test.ts	LayerTransform, SketchDocument, IDENTITY_AFFINE, isAffineTransform, makeSingleQuadTransform, fxComposeMatrix as composeAffineMatrix, getRasterBounds, scaledHalfExtents, rotatePoint, dist, HANDLE_RADIUS, ROTATION_HANDLE_OFFSET, TransformHandle, computeRotateTransform	Each appears only on its own import line
web/src/components/sketch/__tests__/moveTransformUnification.test.ts	LayerTransform, makeAffineTransform, quadOf, createPreviewSession, getRasterBounds, getToolHandler	Same; getToolHandler was the only binding from ../tools, so that import goes too
web/src/components/sketch/__tests__/helperToolSession.test.ts	HelperSetupInfo, HelperDrawInfo, createDefaultLayer	The type-only import from HelperToolSession had no remaining names
web/src/components/sketch/__tests__/transformPreviewBoundaries.test.tsx	React, createDefaultLayer, SketchDocument	jsx: "react-jsx" — no React import needed
web/src/components/sketch/__tests__/sketchFeaturesCoverage.test.ts	LayerContentBounds, getCanvasRasterBounds	Unreferenced
web/src/components/hugging_face/model_list/__tests__/useModels.scope.test.tsx	getHfCacheKey, UnifiedModel	Unreferenced
web/src/components/node_types/editing/promptComposer/__tests__/promptTokens.test.ts	tokenizePrompt	Imported but never exercised; the suite only covers tokenizePromptLine
web/src/contexts/__tests__/EditorInsertionContext.test.tsx	* as React	jsx: "react-jsx"
web/src/lib/dragdrop/__tests__/useDropZone.test.tsx	DragData	Unreferenced
electron/src/runtime/packages/__tests__/registry.test.ts	RuntimeContext, RuntimeResolution, RuntimeStatus	Unreferenced
electron/src/__tests__/ipc.test.ts	updateTrayMenu	Only consumer was the dead updateTrayMenuMock below
electron/src/__tests__/events.test.ts	getMainWindow	Only consumer was the dead getMainWindowMock below

Unused locals

File	Removed	Why
electron/src/__tests__/events.test.ts	getMainWindowMock	Assigned, never read — the suite asserts on mockWindow.webContents.send directly
electron/src/__tests__/ipc.test.ts	updateTrayMenuMock	Assigned, never read
electron/src/__tests__/settings.test.ts	originalHomedir	Assigned, never read; the suite restores via (os.homedir as jest.Mock).mockRestore()
web/src/__tests__/performance/nodeComponentsPerformance.test.tsx	_assertPerf and its SHOULD_ENFORCE_PERF flag	A perf-gate helper no test ever calls; the PERF_TESTS env var it read is referenced nowhere else in the repo

Abandoned commentary

web/src/stores/timeline/__tests__/TimelineStore.test.ts — a 7-line block of contradicting scratch notes ("No wait...", "Actually we need...") above the trimClipStart no-op test, replaced by one line stating the arithmetic the test actually checks.

Not removed

Things the scan flagged that turned out to be live:

• web/src/perf/realtimePerfHarness.ts — reached from web/perf-realtime.html, not from an import.
• web/src/components/ChatMarkdownTest.tsx — lazy-routed in web/src/index.tsx; its "unused const result" is inside a markdown fixture string.
• Story exports in web/src/stories/* and __mocks__/* — consumed by Storybook and Jest by convention, not by name.
• ~40 web and ~20 mobile files carry an unused import React from "react". Both would be safe to strip (jsx: "react-jsx"), but that sweep alone blows the 15-file budget, so it is left for a follow-up.

Verification

npm run typecheck   # pass
npm run lint        # pass (pre-existing warnings only)
npm run test        # pass

🤖 Generated with Claude Code