feat: add git integration panel

- Add Rust backend for git operations (status, diff, branches, commit, push, pull, fetch, stage, unstage, discard, create branch)
- Add GitPanel.svelte component with three tabs: Changes, Branches, History
- Integrate git button into StatusBar with link icon
- Use consistent accent color theming for buttons

src-tauri/src/lib.rs

@@ -2,6 +2,7 @@ mod achievements;
 mod bridge_manager;
 mod commands;
 mod config;
+mod git;
 mod notifications;
 mod sessions;
 mod snippets;
@@ -17,6 +18,7 @@ mod wsl_notifications;
 use bridge_manager::create_shared_bridge_manager;
 use commands::load_saved_achievements;
 use commands::*;
+use git::*;
 use notifications::*;
 use sessions::*;
 use snippets::*;
@@ -118,6 +120,20 @@ pub fn run() {
             delete_snippet,
             get_snippet_categories,
             reset_default_snippets,
+            git_status,
+            git_diff,
+            git_branches,
+            git_checkout,
+            git_stage,
+            git_unstage,
+            git_stage_all,
+            git_commit,
+            git_push,
+            git_pull,
+            git_fetch,
+            git_log,
+            git_discard,
+            git_create_branch,
         ])
         .run(tauri::generate_context!())
         .expect("error while running tauri application");