fix: prevent duplicate repository connection notifications (#2474)

- Add isConnecting flag to prevent race condition
- Disable submit button during connection process
- Ensure notification appears only once
- Use finally block for proper cleanup

Fixes #2472

Author: AbhiVarde

src/lib/components/git/connectRepoModal.svelte

@@ -112,7 +112,6 @@
                         repository.set(e);
                         repositoryName = e.name;
                         selectedRepository = e.id;
-                        connectRepo();
                     }} />
             {/if}
         </Layout.Stack>