fix: fix unused imports and db initialization error

Co-authored-by: aider (openai/andrew/openrouter/qwen/qwen3-coder) <aider@aider.chat>

src/main.rs

@@ -166,7 +166,7 @@ fn main() -> Result<(), Error> {
         .with_context(|| format!("Unable to create data directory {:?}", data_path))?;
 
     // Initialize database
-    let mut conn = db::init(&db_path)?;
+    let mut conn = db::init_db(&db_path)?;
 
     match mode {
         KeepModes::Save => modes::save::mode_save(&mut cmd, &settings, ids, tags, &mut conn, data_path),