Implement vim-style navigation and visual mode

- Add vim-style h key: closes folders and jumps to parent
- Implement stop() method in player for proper playback stopping
- Add space key to restart playback when stopped
- Add playlist color coding: green (playing), blue (paused), yellow (stopped)
- Fix n/p keys to preserve player state when switching tracks
- Implement vim-style visual mode with v key for multi-file selection
- Visual mode exits automatically on play/add actions
- Remove unused play_previous method
- Bump version to 0.1.7

src/state/mod.rs

@@ -33,6 +33,8 @@ pub struct AppState {
     pub search_match_index: usize,
     pub tab_search_results: Vec<PathBuf>,
     pub tab_search_index: usize,
+    pub visual_mode: bool,
+    pub visual_anchor: usize,
 }
 
 #[derive(Debug, Clone)]
@@ -71,6 +73,8 @@ impl AppState {
             search_match_index: 0,
             tab_search_results: Vec::new(),
             tab_search_index: 0,
+            visual_mode: false,
+            visual_anchor: 0,
         }
     }
 
@@ -81,12 +85,20 @@ impl AppState {
             if self.selected_index < self.scroll_offset {
                 self.scroll_offset = self.selected_index;
             }
+            // Update visual selection if in visual mode
+            if self.visual_mode {
+                self.update_visual_selection();
+            }
         }
     }
 
     pub fn move_selection_down(&mut self) {
         if self.selected_index < self.flattened_items.len().saturating_sub(1) {
             self.selected_index += 1;
+            // Update visual selection if in visual mode
+            if self.visual_mode {
+                self.update_visual_selection();
+            }
         }
     }
 
@@ -120,11 +132,39 @@ impl AppState {
     }
 
     pub fn collapse_selected(&mut self) {
-        if let Some(item) = self.get_selected_item() {
+        let item = self.get_selected_item().cloned();
+        if let Some(item) = item {
             if item.node.is_dir {
                 let path = item.node.path.clone();
-                self.expanded_dirs.remove(&path);
-                self.rebuild_flattened_items();
+                let was_expanded = self.expanded_dirs.contains(&path);
+
+                if was_expanded {
+                    // Close the expanded folder
+                    self.expanded_dirs.remove(&path);
+                    self.rebuild_flattened_items();
+                } else {
+                    // Folder is collapsed, close parent instead and jump to it
+                    if let Some(parent) = path.parent() {
+                        let parent_buf = parent.to_path_buf();
+                        self.expanded_dirs.remove(&parent_buf);
+                        self.rebuild_flattened_items();
+                        // Jump to parent folder
+                        if let Some(parent_idx) = self.flattened_items.iter().position(|i| i.node.path == parent_buf) {
+                            self.selected_index = parent_idx;
+                        }
+                    }
+                }
+            } else {
+                // Close parent folder when on a file and jump to it
+                if let Some(parent) = item.node.path.parent() {
+                    let parent_buf = parent.to_path_buf();
+                    self.expanded_dirs.remove(&parent_buf);
+                    self.rebuild_flattened_items();
+                    // Jump to parent folder
+                    if let Some(parent_idx) = self.flattened_items.iter().position(|i| i.node.path == parent_buf) {
+                        self.selected_index = parent_idx;
+                    }
+                }
             }
         }
     }
@@ -140,13 +180,37 @@ impl AppState {
     }
 
     pub fn toggle_mark(&mut self) {
-        if let Some(item) = self.get_selected_item() {
-            if !item.node.is_dir {
-                let path = item.node.path.clone();
-                if self.marked_files.contains(&path) {
-                    self.marked_files.remove(&path);
-                } else {
-                    self.marked_files.insert(path);
+        if self.visual_mode {
+            // Exit visual mode and mark all files in range
+            self.update_visual_selection();
+            self.visual_mode = false;
+        } else {
+            // Enter visual mode
+            self.visual_mode = true;
+            self.visual_anchor = self.selected_index;
+            // Clear previous marks when entering visual mode
+            self.marked_files.clear();
+            // Mark current file
+            if let Some(item) = self.get_selected_item() {
+                if !item.node.is_dir {
+                    self.marked_files.insert(item.node.path.clone());
+                }
+            }
+        }
+    }
+
+    fn update_visual_selection(&mut self) {
+        // Clear marks
+        self.marked_files.clear();
+
+        // Mark all files between anchor and current position
+        let start = self.visual_anchor.min(self.selected_index);
+        let end = self.visual_anchor.max(self.selected_index);
+
+        for i in start..=end {
+            if let Some(item) = self.flattened_items.get(i) {
+                if !item.node.is_dir {
+                    self.marked_files.insert(item.node.path.clone());
                 }
             }
         }
@@ -229,14 +293,6 @@ impl AppState {
         }
     }
 
-    pub fn play_previous(&mut self) {
-        if self.playlist_index > 0 {
-            self.playlist_index -= 1;
-            self.current_file = Some(self.playlist[self.playlist_index].clone());
-            self.player_state = PlayerState::Playing;
-        }
-    }
-
     pub fn refresh_flattened_items(&mut self) {
         // Keep current expanded state after rescan
         self.rebuild_flattened_items();