feat: enhance strictness of Rust compiler settings and improve code quality by treating warnings as errors

src/model/editlog.rs

@@ -27,8 +27,6 @@ const MAX_MEMORY_ENTRIES: usize = 10_000;
 pub struct EditLog {
     pub entries: Vec<EditLogEntry>,
     pub path: std::path::PathBuf,
-    /// Total entries on disk (may exceed `entries.len()` if truncated).
-    pub total_on_disk: usize,
 }
 
 impl EditLog {
@@ -37,28 +35,26 @@ impl EditLog {
     /// `MAX_MEMORY_ENTRIES` to prevent OOM).
     pub fn new(session_dir: &std::path::Path) -> Self {
         let path = session_dir.join("edits.jsonl");
-        let (entries, total_on_disk) = Self::load_from_disk(&path);
-        EditLog { entries, path, total_on_disk }
+        let entries = Self::load_from_disk(&path);
+        EditLog { entries, path }
     }
 
     /// Reads lines of edits.jsonl into memory, keeping only the most recent
     /// `MAX_MEMORY_ENTRIES` entries. The full history is preserved on disk
     /// regardless of the in-memory limit.
-    fn load_from_disk(path: &std::path::Path) -> (Vec<EditLogEntry>, usize) {
+    fn load_from_disk(path: &std::path::Path) -> Vec<EditLogEntry> {
         let file = match std::fs::File::open(path) {
             Ok(f) => f,
-            Err(_) => return (Vec::new(), 0),
+            Err(_) => return Vec::new(),
         };
         use std::io::{BufRead, BufReader};
         let reader = BufReader::new(file);
         let mut entries: Vec<EditLogEntry> = Vec::new();
-        let mut total = 0usize;
         for line in reader.lines() {
             let line = match line {
                 Ok(l) => l,
                 Err(_) => continue,
             };
-            total += 1;
             if let Ok(entry) = serde_json::from_str::<EditLogEntry>(&line) {
                 // Keep only the most recent entries in memory
                 if entries.len() >= MAX_MEMORY_ENTRIES {
@@ -68,7 +64,7 @@ impl EditLog {
                 entries.push(entry);
             }
         }
-        (entries, total)
+        entries
     }
 
     /// Append one entry to `edits.jsonl` on disk and to the in-memory log,