add auto-updater and git workflow enhancements

This change introduces a comprehensive auto-update mechanism for the application and significant improvements to the integrated Git client experience.

Key features include:
- **Automated Release Workflow:** A new Gitea Actions workflow (`app_builder.yaml`) and a Python `cicd_tool` are added to automatically build, sign, and upload release artifacts to S3-compatible storage (MinIO) upon a new release. This also generates the `latest.json` file required by the updater.
- **Tauri Updater Integration:** The `tauri-plugin-updater` is integrated into the application, enabling it to check for and apply updates seamlessly.
- **Robust Git Push Handling:** The application now intelligently handles non-fast-forward push failures by prompting the user to perform a pull/merge operation before re-attempting the push.
- **Enhanced File Comparison:** A new `compare_file_to_parent` command is introduced, allowing detailed file diffs against a commit's direct parent, including the "empty tree" for initial commits.
- **Explorer Panel Improvements:** "Expand All" and "Collapse All" functionality is added to the file explorer for better navigation.

src/lib/git.ts

@@ -128,6 +128,15 @@ export function compareFileToHead(
   return invoke<GitCommitComparison>("compare_file_to_head", { path, commit, file });
 }
 
+export function compareFileToParent(
+  path: string,
+  commit: string,
+  file: string,
+  oldFile: string | null = null,
+): Promise<GitCommitComparison> {
+  return invoke<GitCommitComparison>("compare_file_to_parent", { path, commit, file, oldFile });
+}
+
 export function searchCodeIntroductions(
   path: string,
   query: string,