feat(clone): add repository cloning flow to UI and backend

This introduces a new Tauri command to clone a remote repository into a
validated destination folder, then return the full repository bundle for
immediate rendering. The Svelte app gains a clone dialog and a new action
in repository management, wiring the cloned bundle into existing refresh
helpers. Dialog backdrops were also adjusted to rely on explicit close
controls.

- Add clone_repository command and core cloning logic in Rust
- Create CloneRepositoryDialog and integrate it into App.svelte
- Improve clone-related styling and tighten dialog backdrop behavior

src-tauri/src/main.rs

@@ -6,15 +6,16 @@ mod git;
 use badge::set_sync_badge;
 use git::{
     SearchCancellationState, apply_file_patch, cancel_code_search, cancel_file_history,
-    checkout_branch, commit, commit_ai_generate, commit_ai_load, commit_ai_local_models,
-    commit_ai_status, compare_commits, compare_file_to_head, compare_file_to_parent, create_branch,
-    cred_delete, cred_load, cred_save, delete_branch, diff_file_against_working_tree, fetch,
-    get_file_patch, get_remote_url, get_status, list_branches, list_commits, list_file_history,
-    list_repository_files, list_stashes, merge_branch, open_repo_in_explorer, open_repository,
-    open_repository_bundle, open_repository_file, pull, push, read_conflict, rebase_abort,
-    rebase_branch, rebase_continue, rename_branch, resolve_conflict, resolve_conflict_side,
-    restore_file_from_commit, restore_files, restore_to_commit, search_code_introductions,
-    stage_files, stash_apply, stash_drop, stash_pop, stash_push, unstage_files,
+    checkout_branch, clone_repository, commit, commit_ai_generate, commit_ai_load,
+    commit_ai_local_models, commit_ai_status, compare_commits, compare_file_to_head,
+    compare_file_to_parent, create_branch, cred_delete, cred_load, cred_save, delete_branch,
+    diff_file_against_working_tree, fetch, get_file_patch, get_remote_url, get_status,
+    list_branches, list_commits, list_file_history, list_repository_files, list_stashes,
+    merge_branch, open_repo_in_explorer, open_repository, open_repository_bundle,
+    open_repository_file, pull, push, read_conflict, rebase_abort, rebase_branch, rebase_continue,
+    rename_branch, resolve_conflict, resolve_conflict_side, restore_file_from_commit,
+    restore_files, restore_to_commit, search_code_introductions, stage_files, stash_apply,
+    stash_drop, stash_pop, stash_push, unstage_files,
 };
 
 fn main() {
@@ -25,6 +26,7 @@ fn main() {
         .plugin(tauri_plugin_dialog::init())
         .invoke_handler(tauri::generate_handler![
             open_repository,
+            clone_repository,
             open_repo_in_explorer,
             open_repository_file,
             get_status,