feat: Normalize VCS provider names for cleaner display

Extract meaningful provider names from hostnames by taking the part
immediately before the last dot. This provides cleaner names like
"github" instead of "github.com" and "azure" instead of "dev.azure.com".

Examples:
- github.com → github
- gitlab.com → gitlab
- dev.azure.com → azure
- git.mycompany.com → mycompany

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: runningcode

src/utils/vcs.rs

@@ -201,12 +201,22 @@ impl VcsUrl {
         }
 
         VcsUrl {
-            provider: host.to_lowercase(),
+            provider: extract_provider_name(&host.to_lowercase()),
             id: strip_git_suffix(path).to_lowercase(),
         }
     }
 }
 
+fn extract_provider_name(host: &str) -> String {
+    // Take just the part immediately before the last dot
+    let parts: Vec<&str> = host.split('.').collect();
+    if parts.len() >= 2 {
+        parts[parts.len() - 2].to_string()
+    } else {
+        host.to_string()
+    }
+}
+
 fn is_matching_url(a: &str, b: &str) -> bool {
     VcsUrl::parse(a) == VcsUrl::parse(b)
 }