Remove TypeScript path mappings in favor of relative imports

Fixes https://github.com/xtermjs/xterm.js/issues/5896

TypeScript path mappings for common/*, browser/*, and headless/*
were not rewritten in emitted JavaScript, which forced webpack resolve
aliases and NODE_PATH workarounds so runtime could resolve modules.
That added build complexity and broke tooling such as ESLint import/no-cycle.

Changes:
- Convert ~750 imports across src/, addons/, and test/ to relative paths
- Remove common/browser/headless paths and src catch-all mappings from tsconfigs
  (keep @xterm/addon-* demo and addon typings paths)
- Remove webpack resolve.alias for common, browser, headless, and vs
- Drop NODE_PATH from unit tests, benchmarks, and VS Code launch config
- Fix addon-image IIPImageStorage to import ./Types after removing catch-all *

Verified: npm run build, esbuild, package, package-headless
Co-authored-by: Cursor <cursoragent@cursor.com>

addons/addon-image/src/IIPImageStorage.ts

@@ -3,7 +3,7 @@
  * @license MIT
  */
 
-import { IAddImageOpts } from 'Types';
+import { IAddImageOpts } from './Types';
 import { ImageStorage } from './ImageStorage';
 
 /**

addons/addon-image/src/ImageAddon.ts

@@ -5,7 +5,7 @@
 
 import type { ITerminalAddon, IDisposable } from '@xterm/xterm';
 import type { ImageAddon as IImageApi } from '@xterm/addon-image';
-import { Emitter, type IEvent } from 'common/Event';
+import { Emitter, type IEvent } from '../../../src/common/Event';
 import { IIPHandler } from './IIPHandler';
 import { ImageRenderer } from './ImageRenderer';
 import { ImageStorage, CELL_SIZE_DEFAULT } from './ImageStorage';

addons/addon-image/src/ImageRenderer.ts

@@ -6,7 +6,7 @@
 import { toRGBA8888 } from 'sixel/lib/Colors';
 import { IDisposable } from '@xterm/xterm';
 import { ICellSize, ImageLayer, ITerminalExt, IImageSpec, IRenderDimensions, IRenderService } from './Types';
-import { Disposable, MutableDisposable, toDisposable } from 'common/Lifecycle';
+import { Disposable, MutableDisposable, toDisposable } from '../../../src/common/Lifecycle';
 
 const enum Constants {
   PLACEHOLDER_LENGTH = 4096,

addons/addon-image/src/Types.ts

@@ -6,13 +6,13 @@
 import { IDisposable, IMarker, Terminal } from '@xterm/xterm';
 
 // private imports from base repo we build against
-import { Attributes, BgFlags, Content, ExtFlags, UnderlineStyle } from 'common/buffer/Constants';
-import type { AttributeData } from 'common/buffer/AttributeData';
-import type { IParams, IDcsHandler, IOscHandler, IApcHandler, IEscapeSequenceParser } from 'common/parser/Types';
-import type { IBufferLine, IExtendedAttrs, IInputHandler } from 'common/Types';
-import type { ITerminal, ReadonlyColorSet } from 'browser/Types';
-import type { IRenderDimensions } from 'browser/renderer/shared/Types';
-import type { ICoreBrowserService, IRenderService, IThemeService } from 'browser/services/Services';
+import { Attributes, BgFlags, Content, ExtFlags, UnderlineStyle } from '../../../src/common/buffer/Constants';
+import type { AttributeData } from '../../../src/common/buffer/AttributeData';
+import type { IParams, IDcsHandler, IOscHandler, IApcHandler, IEscapeSequenceParser } from '../../../src/common/parser/Types';
+import type { IBufferLine, IExtendedAttrs, IInputHandler } from '../../../src/common/Types';
+import type { ITerminal, ReadonlyColorSet } from '../../../src/browser/Types';
+import type { IRenderDimensions } from '../../../src/browser/renderer/shared/Types';
+import type { ICoreBrowserService, IRenderService, IThemeService } from '../../../src/browser/services/Services';
 
 export const enum Cell {
   CONTENT = 0,  // codepoint and wcwidth information (enum Content)

addons/addon-image/src/tsconfig.json

@@ -12,10 +12,9 @@
       "../../../node_modules/@types/mocha"
     ],
     "paths": {
-      "browser/*": [ "../../../src/browser/*" ],
-      "common/*": [ "../../../src/common/*" ],
-      "@xterm/addon-image": [ "../typings/addon-image.d.ts" ],
-      "*": [ "./*" ]
+      "@xterm/addon-image": [
+        "../typings/addon-image.d.ts"
+      ]
     }
   },
   "include": [
@@ -23,7 +22,11 @@
     "../../../typings/xterm.d.ts"
   ],
   "references": [
-    { "path": "../../../src/browser" },
-    { "path": "../../../src/common" }
+    {
+      "path": "../../../src/browser"
+    },
+    {
+      "path": "../../../src/common"
+    }
   ]
 }