phase9(ci): unblock Compile & Hygiene -- diff .d.ts + appimage hygiene ignore

Two pre-existing blockers (red on main too, NOT introduced by the branch) made
the "Compile & Hygiene" CI job fail. Both fixed minimally:

1. core-ci/tsgo TS2307: findDiffs.ts imports the GENERATED
   ../react/out/diff/index.js. CI runs the typecheck BEFORE buildreact, so the
   artifact is absent and the module cannot resolve. The 6 sibling react/out
   modules already ship committed index.d.ts files (out/ is gitignored, they are
   force-added) -- diff/ was the only one missing one. Add a hand-maintained
   out/diff/index.d.ts (diffLines + Change) so the import is type-resolvable
   without building react, matching the existing pattern. tsup emits .js only
   (dts is disabled, clean:false) so a local buildreact will not clobber it.

2. hygiene: scripts/appimage/create_appimage.sh fails on (a) intentional
   translated (non-ASCII) desktop-menu names and (b) its own space indentation.
   Exclude it from unicodeFilter + indentationFilter in build/filters.ts (the
   same treatment build/**/*.sh and the cortexide React tree already get) rather
   than stripping the translations.

Verification:
- tsgo with react/out/diff/index.js hidden (exact CI condition: react unbuilt)
  -> 0 errors, no findDiffs error. Normal-state tsgo also 0.
- node build/hygiene.ts scripts/appimage/create_appimage.sh -> exit 0 (was 14
  errors). hygiene on the new .d.ts -> exit 0.
- cortexide node subset: 551 passing, 0 failing.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: Tajudeen

build/filters.ts

@@ -67,6 +67,10 @@ export const unicodeFilter = Object.freeze<string[]>([
 	// extensions/copilot has its own code style
 	'!extensions/copilot/**',
 
+	// CortexIDE AppImage packaging script embeds intentional translated (non-ASCII)
+	// desktop-menu names (Japanese/Korean/Russian/Chinese "New Empty Window" etc.)
+	'!scripts/appimage/create_appimage.sh',
+
 	'!src/vs/base/browser/dompurify/**',
 	'!src/vs/workbench/services/keybinding/browser/keyboardLayouts/**',
 	'!src/vs/workbench/contrib/terminal/common/scripts/psreadline/**',
@@ -143,6 +147,8 @@ export const indentationFilter = Object.freeze<string[]>([
 	'!**/*.{svg,exe,png,bmp,jpg,scpt,bat,cmd,cur,ttf,woff,eot,md,ps1,psm1,template,yaml,yml,d.ts.recipe,ico,icns,plist,opus,admx,adml,wasm}',
 	'!build/{lib,download,linux,darwin}/**/*.js',
 	'!build/**/*.sh',
+	// CortexIDE AppImage packaging script keeps its own (space) shell indentation
+	'!scripts/appimage/create_appimage.sh',
 	'!build/azure-pipelines/**/*.js',
 	'!build/azure-pipelines/**/*.config',
 	'!build/npm/gyp/custom-headers/*.patch',

src/vs/workbench/contrib/cortexide/browser/react/out/diff/index.d.ts

@@ -0,0 +1,21 @@
+/*--------------------------------------------------------------------------------------
+ *  Copyright 2025 Glass Devtools, Inc. All rights reserved.
+ *  Licensed under the Apache License, Version 2.0. See LICENSE.txt for more information.
+ *--------------------------------------------------------------------------------------*/
+
+// Hand-maintained type declarations for the generated diff bundle
+// (browser/react/out/diff/index.js, produced by `npm run buildreact`). Committed
+// alongside the sibling react/out *.d.ts files (out/ is gitignored, these are force-added)
+// so the type checker can resolve `import { diffLines } from '../react/out/diff/index.js'`
+// in findDiffs.ts WITHOUT first building react -- CI runs the typecheck before buildreact.
+// The runtime impl re-exports diffLines/Change from the `diff` npm package
+// (see react/src/diff/index.tsx).
+
+export interface Change {
+	count?: number;
+	value: string;
+	added?: boolean;
+	removed?: boolean;
+}
+
+export declare function diffLines(oldStr: string, newStr: string): Change[];