feat: enhanced status bar with word count, char count, line/col, encoding

- Restructured status bar into left/right sections with separators
- Added character count, cursor line/column position, encoding, and language mode indicators
- Added cursor position tracking via CodeMirror onUpdate callback
- Added file path display that updates on tab switch
- Simplified word count display for cleaner status bar layout

src/styles.css

@@ -139,11 +139,18 @@ body {
     background: #d0d0d0;
 }
 
+.toolbar-group {
+    display: flex;
+    align-items: center;
+    gap: 2px;
+}
 .toolbar-separator {
     width: 1px;
-    height: 24px;
-    background: #ccc;
-    margin: 0 8px;
+    height: 20px;
+    background: rgba(0, 0, 0, 0.12);
+    margin: 0 6px;
+    align-self: center;
+    flex-shrink: 0;
 }
 
 /* Editor Container */
@@ -287,11 +294,26 @@ body {
 .status-bar {
     display: flex;
     justify-content: space-between;
-    padding: 4px 12px;
+    align-items: center;
+    padding: 2px 12px;
     background: #f5f5f5;
     border-top: 1px solid #ddd;
     font-size: 12px;
     color: #666;
+    min-height: 24px;
+    flex-shrink: 0;
+}
+.status-bar-left, .status-bar-right {
+    display: flex;
+    align-items: center;
+    gap: 4px;
+}
+.status-separator {
+    color: var(--gray-300, #d1d5db);
+    margin: 0 2px;
+}
+.status-item {
+    white-space: nowrap;
 }
 
 /* Preview Styles */