fix: strip line/column suffixes from Windows path links

This PR implements a workaround for issue #26902 where terminal link handlers on Windows (specifically in the Antigravity editor and standard VS Code) fail to correctly parse and open absolute file paths that include `:line:column` suffixes. On Windows, colons are invalid characters in file paths (except for the drive letter), causing `FileSystemError` when these links are clicked.

### Changes:
- Added `stripLineColumnSuffixes` utility in `packages/core/src/utils/textUtils.ts`.
- Applied this utility across various output formatting paths to ensure safe link generation on Windows:
    - `packages/cli/src/ui/utils/textOutput.ts` (Non-interactive mode)
    - `packages/cli/src/ui/utils/markdownParsingUtils.ts` (Agent output in interactive mode)
    - `packages/core/src/utils/debugLogger.ts` (Core debug logging)
    - `packages/cli/src/ui/utils/ConsolePatcher.ts` (Interactive mode console redirection)
- Added comprehensive unit tests in `packages/core/src/utils/textUtils.test.ts`.

These changes are only active when running on Windows (`process.platform === 'win32'`).

Fixes #26902

cc @google-gemini/gemini-cli-maintainers

packages/cli/src/ui/utils/ConsolePatcher.ts

@@ -7,6 +7,7 @@
 /* eslint-disable no-console */
 
 import util from 'node:util';
+import { stripLineColumnSuffixes } from '@google/gemini-cli-core';
 import type { ConsoleMessageItem } from '../types.js';
 
 interface ConsolePatcherParams {
@@ -45,7 +46,10 @@ export class ConsolePatcher {
     console.info = this.originalConsoleInfo;
   };
 
-  private formatArgs = (args: unknown[]): string => util.format(...args);
+  private formatArgs = (args: unknown[]): string => {
+    const formatted = util.format(...args);
+    return stripLineColumnSuffixes(formatted);
+  };
 
   private patchConsoleMethod =
     (type: 'log' | 'warn' | 'error' | 'debug' | 'info') =>

packages/cli/src/ui/utils/markdownParsingUtils.ts

@@ -11,7 +11,7 @@ import {
   INK_NAME_TO_HEX_MAP,
 } from '../themes/color-utils.js';
 import { theme } from '../semantic-colors.js';
-import { debugLogger } from '@google/gemini-cli-core';
+import { debugLogger, stripLineColumnSuffixes } from '@google/gemini-cli-core';
 import { convertLatexToUnicode } from './latexToUnicode.js';
 
 // Constants for Markdown parsing
@@ -108,6 +108,12 @@ export const parseMarkdownToANSI = (
   defaultColor?: string,
 ): string => {
   const baseColor = defaultColor ?? theme.text.primary;
+  // Strip line and column number suffixes from Windows paths BEFORE any other
+  // processing. This ensures that we don't break markdown parsing or URL
+  // detection, and that the final output is safe for Windows terminal links.
+  // See issue #26902.
+  const sanitizedRawText = stripLineColumnSuffixes(rawText);
+
   // Convert LaTeX-style math/commands to Unicode BEFORE tokenizing markdown,
   // so constructs like `$\{P_0, \dots, P_n\}$` are handled as a whole even
   // when they contain underscores (which the tokenizer would otherwise treat
@@ -115,7 +121,7 @@ export const parseMarkdownToANSI = (
   // conversion so their contents are preserved verbatim. Unknown `\foo`
   // sequences are left alone, so Windows paths and regex escapes survive.
   // See issue #25656.
-  const text = convertLatexPreservingSpans(rawText);
+  const text = convertLatexPreservingSpans(sanitizedRawText);
   // Early return for plain text without markdown or URLs
   if (!/[*_~`<[https?:]/.test(text)) {
     return ansiColorize(text, baseColor);

packages/cli/src/ui/utils/textOutput.ts

@@ -10,6 +10,7 @@
  */
 
 import stripAnsi from 'strip-ansi';
+import { stripLineColumnSuffixes } from '@google/gemini-cli-core';
 
 export class TextOutput {
   private atStartOfLine = true;
@@ -27,8 +28,9 @@ export class TextOutput {
     if (str.length === 0) {
       return;
     }
-    this.outputStream.write(str);
-    const strippedStr = stripAnsi(str);
+    const processedStr = stripLineColumnSuffixes(str);
+    this.outputStream.write(processedStr);
+    const strippedStr = stripAnsi(processedStr);
     if (strippedStr.length > 0) {
       this.atStartOfLine = strippedStr.endsWith('\n');
     }