feat: resizable character panel and full-height sprite

- Change sprite to use full height instead of full width for better scaling
- Add draggable divider between character panel and terminal
- Persist panel width preference in config (min: 200px, max: 600px)

Closes #10

src/routes/+page.svelte

@@ -24,6 +24,35 @@
   let updateNotification: UpdateNotification;
   let achievementPanelOpen = $state(false);
 
+  // Resizable panel state
+  let panelWidth = $state(320); // Default width in pixels
+  let isResizing = $state(false);
+  const MIN_PANEL_WIDTH = 200;
+  const MAX_PANEL_WIDTH = 600;
+
+  function startResize(event: MouseEvent) {
+    isResizing = true;
+    event.preventDefault();
+    document.addEventListener("mousemove", handleResize);
+    document.addEventListener("mouseup", stopResize);
+  }
+
+  function handleResize(event: MouseEvent) {
+    if (!isResizing) return;
+    const newWidth = event.clientX;
+    panelWidth = Math.max(MIN_PANEL_WIDTH, Math.min(MAX_PANEL_WIDTH, newWidth));
+  }
+
+  function stopResize() {
+    if (isResizing) {
+      isResizing = false;
+      document.removeEventListener("mousemove", handleResize);
+      document.removeEventListener("mouseup", stopResize);
+      // Save the panel width to config
+      configStore.updateConfig({ character_panel_width: panelWidth });
+    }
+  }
+
   // Global keyboard shortcuts
   function handleGlobalKeydown(event: KeyboardEvent) {
     // Don't trigger shortcuts when typing in inputs (except for specific ones)
@@ -105,6 +134,11 @@
         await window.setAlwaysOnTop(true);
       }
 
+      // Load saved panel width
+      if (config.character_panel_width) {
+        panelWidth = config.character_panel_width;
+      }
+
       // Initialize notification settings sync
       initNotificationSync();
 
@@ -134,13 +168,22 @@
   <main class="flex-1 flex overflow-hidden">
     <!-- Left panel: Character display -->
     <div
-      class="character-panel w-1/3 flex flex-col items-center justify-center border-r border-[var(--border-color)] bg-[var(--bg-secondary)]/50"
+      class="character-panel flex flex-col items-center justify-center bg-[var(--bg-secondary)]/50"
+      style="width: {panelWidth}px; min-width: {MIN_PANEL_WIDTH}px; max-width: {MAX_PANEL_WIDTH}px;"
     >
       <AnimeGirl />
     </div>
 
+    <!-- Resize handle -->
+    <!-- svelte-ignore a11y_no_static_element_interactions -->
+    <div
+      class="resize-handle w-1 cursor-col-resize bg-[var(--border-color)] hover:bg-[var(--accent-primary)] transition-colors flex-shrink-0"
+      class:bg-[var(--accent-primary)]={isResizing}
+      onmousedown={startResize}
+    ></div>
+
     <!-- Right panel: Terminal and input -->
-    <div class="terminal-panel flex-1 flex flex-col">
+    <div class="terminal-panel flex-1 flex flex-col min-w-0">
       <Terminal />
       <InputBar />
     </div>
@@ -169,7 +212,11 @@
   }
 
   .character-panel {
-    min-width: 320px;
     background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
   }
+
+  .resize-handle:hover,
+  .resize-handle:active {
+    width: 4px;
+  }
 </style>