fix: add missing meta_name implementation and fix compilation errors

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/meta_plugin/magic.rs

@@ -1,6 +1,4 @@
-use anyhow::Result;
 use magic::{Cookie, CookieFlags};
-use rusqlite::Connection;
 use std::io;
 
 use crate::common::PIPESIZE;
@@ -128,14 +126,14 @@ impl MetaPlugin for MagicFileMetaPlugin {
         // Initialize the magic cookie once
         let cookie = match Cookie::open(Default::default()) {
             Ok(cookie) => cookie,
-            Err(e) => {
+            Err(_e) => {
                 return crate::meta_plugin::MetaPluginResponse {
                     metadata: Vec::new(),
                     is_finalized: true,
                 };
             }
         };
-        if let Err(e) = cookie.load(&[] as &[&str]) {
+        if let Err(_e) = cookie.load(&[] as &[&str]) {
             return crate::meta_plugin::MetaPluginResponse {
                 metadata: Vec::new(),
                 is_finalized: true,
@@ -173,9 +171,10 @@ impl MetaPlugin for MagicFileMetaPlugin {
             }
         }
 
+        let is_finalized = !metadata.is_empty();
         crate::meta_plugin::MetaPluginResponse {
             metadata,
-            is_finalized: !metadata.is_empty(),
+            is_finalized,
         }
     }