✨ Add file history panel to Explore mode with compact companion bar

Replace the verbose companion session panel with a navigable file history
view that shows git log entries for the selected file. The right panel now
displays commit history with hash, message, author, time, and +/- stats.

Key changes:
- Add FileLogEntry type for commit metadata with additions/deletions
- Load git log asynchronously when file selection changes
- Support global commit log toggle (L key) for repo-wide history
- Implement keyboard navigation (j/k, g/G, Ctrl+d/u) in history panel
- Add 'y' to copy commit hash, Enter to view commit details
- Create compact companion status bar showing branch, staged/unstaged
  counts, and session duration in a single line
- Add scrollbar for large commit histories

Author: hyperb1iss

src/companion/branch_memory.rs

@@ -95,8 +95,7 @@ impl BranchMemory {
 
     /// Check if this is a returning visit (visited before more than 5 minutes ago)
     pub fn is_returning_visit(&self) -> bool {
-        self.session_count > 1
-            && self.time_since_last_visit() > chrono::Duration::minutes(5)
+        self.session_count > 1 && self.time_since_last_visit() > chrono::Duration::minutes(5)
     }
 
     /// Generate a welcome message if returning
@@ -114,6 +113,9 @@ impl BranchMemory {
             format!("{} minutes ago", duration.num_minutes())
         };
 
-        Some(format!("Welcome back to {}! Last here {}", self.branch_name, time_str))
+        Some(format!(
+            "Welcome back to {}! Last here {}",
+            self.branch_name, time_str
+        ))
     }
 }

src/companion/mod.rs

@@ -57,7 +57,10 @@ impl CompanionService {
                 Some(w)
             }
             Err(e) => {
-                tracing::warn!("Failed to start file watcher: {}. Companion will run without live updates.", e);
+                tracing::warn!(
+                    "Failed to start file watcher: {}. Companion will run without live updates.",
+                    e
+                );
                 None
             }
         };

src/companion/storage.rs

@@ -25,8 +25,12 @@ impl CompanionStorage {
         let branches_dir = repo_dir.join("branches");
 
         // Ensure directories exist
-        fs::create_dir_all(&branches_dir)
-            .with_context(|| format!("Failed to create companion directory: {}", branches_dir.display()))?;
+        fs::create_dir_all(&branches_dir).with_context(|| {
+            format!(
+                "Failed to create companion directory: {}",
+                branches_dir.display()
+            )
+        })?;
 
         Ok(Self {
             repo_dir,
@@ -52,8 +56,7 @@ impl CompanionStorage {
 
     /// Sanitize branch name for filesystem
     fn sanitize_branch_name(branch: &str) -> String {
-        branch
-            .replace(['/', '\\', ':', '*', '?', '"', '<', '>', '|'], "_")
+        branch.replace(['/', '\\', ':', '*', '?', '"', '<', '>', '|'], "_")
     }
 
     /// Get session file path
@@ -104,8 +107,13 @@ impl CompanionStorage {
         drop(file);
 
         // Atomic rename
-        fs::rename(&temp_path, path)
-            .with_context(|| format!("Failed to rename {} to {}", temp_path.display(), path.display()))?;
+        fs::rename(&temp_path, path).with_context(|| {
+            format!(
+                "Failed to rename {} to {}",
+                temp_path.display(),
+                path.display()
+            )
+        })?;
 
         Ok(())
     }
@@ -134,9 +142,10 @@ impl CompanionStorage {
                 let entry = entry?;
                 let path = entry.path();
                 if path.extension().is_some_and(|e| e == "json")
-                    && let Some(stem) = path.file_stem() {
-                        branches.push(stem.to_string_lossy().to_string());
-                    }
+                    && let Some(stem) = path.file_stem()
+                {
+                    branches.push(stem.to_string_lossy().to_string());
+                }
             }
         }
 

src/companion/watcher.rs

@@ -6,7 +6,7 @@
 use anyhow::{Context, Result};
 use ignore::gitignore::{Gitignore, GitignoreBuilder};
 use notify::{RecommendedWatcher, RecursiveMode};
-use notify_debouncer_full::{new_debouncer, DebounceEventResult, Debouncer, RecommendedCache};
+use notify_debouncer_full::{DebounceEventResult, Debouncer, RecommendedCache, new_debouncer};
 use std::path::{Path, PathBuf};
 use std::sync::Arc;
 use std::time::Duration;
@@ -92,7 +92,9 @@ impl FileWatcherService {
             // Fallback: just ignore .git
             let mut fallback = GitignoreBuilder::new(repo_path);
             let _ = fallback.add_line(None, ".git/");
-            fallback.build().expect("Failed to build fallback gitignore")
+            fallback
+                .build()
+                .expect("Failed to build fallback gitignore")
         }))
     }
 
@@ -133,7 +135,9 @@ impl FileWatcherService {
 
                         let companion_event = match event.kind {
                             EventKind::Create(_) => Some(CompanionEvent::FileCreated(path.clone())),
-                            EventKind::Modify(_) => Some(CompanionEvent::FileModified(path.clone())),
+                            EventKind::Modify(_) => {
+                                Some(CompanionEvent::FileModified(path.clone()))
+                            }
                             EventKind::Remove(_) => Some(CompanionEvent::FileDeleted(path.clone())),
                             _ => None,
                         };

src/lib.rs

@@ -15,10 +15,10 @@
 
 pub mod agents;
 pub mod changelog;
-pub mod companion;
 pub mod cli;
 pub mod commands;
 pub mod common;
+pub mod companion;
 pub mod config;
 pub mod context;
 pub mod git;