Implement interactive hunk staging and discarding

Introduce a new dialog that allows users to view file changes as individual hunks and selectively stage, unstage, or discard them. This provides more granular control over modifications, similar to `git add -p`.

Enhance branch panel usability by allowing double-click to checkout a branch.

src-tauri/src/main.rs

@@ -3,14 +3,13 @@
 mod git;
 
 use git::{
-    cancel_code_search, checkout_branch, commit, compare_commits, compare_file_to_head,
-    compare_file_to_parent, create_branch, cred_delete, cred_load, cred_save,
-    diff_file_against_working_tree, get_remote_url, get_status, list_branches, list_commits,
-    list_file_history, list_repository_files, merge_branch, open_repository,
-    open_repository_bundle, pull, push,
-    read_conflict, resolve_conflict, resolve_conflict_side, restore_file_from_commit,
-    restore_files, restore_to_commit, search_code_introductions, stage_files, unstage_files,
-    SearchCancellationState,
+    apply_file_patch, cancel_code_search, checkout_branch, commit, compare_commits,
+    compare_file_to_head, compare_file_to_parent, create_branch, cred_delete, cred_load, cred_save,
+    diff_file_against_working_tree, get_file_patch, get_remote_url, get_status, list_branches,
+    list_commits, list_file_history, list_repository_files, merge_branch, open_repository,
+    open_repository_bundle, pull, push, read_conflict, resolve_conflict, resolve_conflict_side,
+    restore_file_from_commit, restore_files, restore_to_commit, search_code_introductions,
+    stage_files, unstage_files, SearchCancellationState,
 };
 
 fn main() {
@@ -27,6 +26,8 @@ fn main() {
             stage_files,
             unstage_files,
             restore_files,
+            get_file_patch,
+            apply_file_patch,
             commit,
             pull,
             push,