# Smart Git URL Parsing for Repository Creation

## Problem

When users add a new repository, they often paste a full browser URL that includes branch names, file paths, or query parameters instead of a clean repository URL. This causes the clone operation to fail with unclear error messages.

**Examples of problematic URLs:**
- `https://github.com/user/repo/tree/main` (includes branch path)
- `https://github.com/user/repo/blob/main/README.md` (includes file path)
- `https://github.com/user/repo?tab=readme-ov-file` (includes query params)
- `https://github.com/user/repo/pull/123` (includes PR path)

**Current behavior:** The backend attempts to clone the exact URL, which fails with "fatal: repository not found" or similar errors.

**User confusion:** Users don't understand why the clone failed since the URL works in their browser.

## Solution

Implement smart URL parsing that:

1. **Detects non-repo URLs**: Recognizes when a URL contains paths like `/tree/`, `/blob/`, `/pull/`, or query parameters
2. **Extracts base repo URL**: Strips away branch names, file paths, query parameters to get `https://host/owner/repo.git`
3. **Suggests correction**: Shows the user the extracted base URL and asks for confirmation
4. **Improves clone handling**: Handles edge cases and provides clear error messages

## Benefits

- **Better UX**: Users get helpful suggestions instead of cryptic errors
- **Fewer support issues**: Self-service correction reduces confusion
- **More robust**: Handles common copy-paste mistakes automatically
- **Educational**: Teaches users what a proper git URL looks like

## Scope

### Backend
- URL parsing utilities to detect and extract base repo URLs
- Enhanced validation in repository creation endpoint
- Clear error messages for unsupported URLs

### Frontend
- UI dialog to show URL correction suggestions
- Option to accept or edit the suggested URL
- Visual indicator for URL validation status
