fix(cli): properly parse project name on windows

[CatoPaus]

Issue Description

Describe the bug
When launching the Genkit Developer UI (genkit start) on a Windows machine without explicitly specifying a name inside genkit({ ... }), the Developer UI displays "unknown" for the project name (and falls back to something like unknown (1234-3100)).

This happens because projectNameFromGenkitFilePath inside @genkit-ai/tools-common relies on splitting the .genkit runtime file path using a hardcoded forward slash (/). Because Windows file paths predominantly use backslashes (\), the function fails to locate the .genkit directory in the path string, resulting in the fallback "unknown".

To Reproduce

1. Initialize a Genkit project on a Windows machine.
2. Ensure you have not explicitly provided a name property to your genkit() initialization.
3. Start the dev server using genkit start -- tsx --watch backend/index.ts.
4. Open the Developer UI and observe that the app name defaults to unknown instead of the actual project directory or package name.

Expected behavior
The Developer UI should correctly parse the project name from the file path on Windows exactly as it does on macOS and Linux.

Proposed Fix
Updating projectNameFromGenkitFilePath to split the file path using a regular expression that accounts for both forward slashes and backslashes /[/\\]/ resolves this issue entirely and remains safely cross-platform.

File: @genkit-ai/tools-common/src/utils/utils.ts

Current Code:

export function projectNameFromGenkitFilePath(filePath: string) {
  const parts = filePath.split('/'); // <-- Fails on Windows
  const basePath = parts
    .slice(0, Math.max(parts.findIndex((value) => value === '.genkit'), 0))
    .join('/');
  return basePath === '' ? 'unknown' : path.basename(basePath);
}

Proposed Code:

export function projectNameFromGenkitFilePath(filePath: string) {
  const parts = filePath.split(/[/\\]/); // <-- Supports Windows & POSIX
  const basePath = parts
    .slice(0, Math.max(parts.findIndex((value) => value === '.genkit'), 0))
    .join('/');
  return basePath === '' ? 'unknown' : path.basename(basePath);
}

[gemini-code-assist]

Code Review

This pull request updates the projectNameFromGenkitFilePath function to support both Windows and POSIX path separators. A potential issue was identified where splitting by backslashes on POSIX systems could lead to incorrect results if a filename contains a backslash. It is recommended to use path.sep to determine the appropriate separator for the current operating system.

[MichaelDoyle]

@CatoPaus thank you!! if you can apply the gemini suggestion above to use path.sep instead, we'll merge this in.

[MichaelDoyle]

/gemini review

[gemini-code-assist]

Code Review

This pull request updates the projectNameFromGenkitFilePath function in genkit-tools/common/src/utils/utils.ts to use path.sep instead of a hardcoded forward slash when splitting file paths, which improves cross-platform compatibility. I have no feedback to provide.