feat(journals): add drag-and-drop zone to import modal

src/routes/journals/ae_comp__modal_journal_import.svelte

@@ -20,6 +20,7 @@
     let is_parsing = $state(false);
     let is_importing = $state(false);
     let import_log: string[] = $state([]);
+    let is_dragging = $state(false);
 
     // Watch for file selection or parser change to trigger parsing
     $effect(() => {
@@ -28,6 +29,34 @@
         }
     });
 
+    function handle_drag_enter(e: DragEvent) {
+        e.preventDefault();
+        e.stopPropagation();
+        is_dragging = true;
+    }
+
+    function handle_drag_leave(e: DragEvent) {
+        e.preventDefault();
+        e.stopPropagation();
+        is_dragging = false;
+    }
+
+    function handle_drag_over(e: DragEvent) {
+        e.preventDefault();
+        e.stopPropagation();
+        is_dragging = true;
+    }
+
+    function handle_drop(e: DragEvent) {
+        e.preventDefault();
+        e.stopPropagation();
+        is_dragging = false;
+        
+        if (e.dataTransfer?.files && e.dataTransfer.files.length > 0) {
+            files = e.dataTransfer.files;
+        }
+    }
+
     async function parse_files() {
         if (!files) return;
         is_parsing = true;
@@ -120,16 +149,41 @@
                 </label>
             </div>
             <div>
-                <label class="label">
+                <div class="label mb-2">
                     <span>Select Files</span>
+                </div>
+                
+                <!-- Drop Zone -->
+                <!-- svelte-ignore a11y_click_events_have_key_events -->
+                <!-- svelte-ignore a11y_no_static_element_interactions -->
+                <div 
+                    class="
+                        border-2 border-dashed rounded-lg p-8 text-center cursor-pointer transition-all duration-200
+                        flex flex-col items-center justify-center gap-2
+                        {is_dragging ? 'border-primary-500 bg-primary-50 dark:bg-primary-900/20' : 'border-gray-300 dark:border-gray-600 hover:border-gray-400 dark:hover:border-gray-500'}
+                    "
+                    ondragenter={handle_drag_enter}
+                    ondragleave={handle_drag_leave}
+                    ondragover={handle_drag_over}
+                    ondrop={handle_drop}
+                    onclick={() => document.getElementById('file_import_input')?.click()}
+                >
+                    <Upload class="h-10 w-10 text-gray-400" />
+                    <p class="text-sm text-gray-500">
+                        <span class="font-semibold text-primary-600 hover:text-primary-500">Click to upload</span> 
+                        or drag and drop
+                    </p>
+                    <p class="text-xs text-gray-400">Markdown (.md) or Text (.txt) files</p>
+                    
                     <input 
+                        id="file_import_input"
                         type="file" 
-                        class="file-input w-full" 
+                        class="hidden" 
                         multiple 
                         accept=".md,.txt"
                         onchange={(e) => files = e.currentTarget.files} 
                     />
-                </label>
+                </div>
             </div>
         </div>