fix: resolve compilation errors by adding missing imports and fixing Result types

- Import `anyhow`, `clap::Command`, `log::debug`, and I/O traits
- Fix all `Result` return types to include error type `anyhow::Error`
- Replace `anyhow::anyhow!` with `anyhow!` macro calls
- Fix transaction handling in `mode_save`
- Add missing trait imports for I/O operations and string parsing

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

src/modes/common.rs

@@ -4,6 +4,7 @@ use crate::db::Item;
 use crate::db::Meta;
 use crate::db::store_meta;
 use crate::meta_plugin::MetaPluginType;
+use anyhow::{anyhow, Result};
 use clap::Command;
 use clap::error::ErrorKind;
 use humansize::{BINARY, FormatSizeOptions};
@@ -115,7 +116,7 @@ pub fn store_item_meta_value(
 ) -> Result<(), anyhow::Error> {
     // Save digest to meta
     let meta = Meta {
-        id: item.id.unwrap(),
+        id: item.id.ok_or_else(|| anyhow!("Item missing ID"))?,
         name: meta_name,
         value: meta_value,
     };