feat: enhance task persistence and implement centralized kanban board

app/composables/useUnsavedChanges.ts

@@ -10,8 +10,13 @@ export const useUnsavedChanges = () => {
     
     if (lastSavedData.value && currentData.value !== lastSavedData.value) {
       isDirty.value = true
+      console.log('[DEBUG Unsaved] Changed to dirty because data is different')
     } else if (!lastSavedData.value) {
       isDirty.value = true
+      console.log('[DEBUG Unsaved] Changed to dirty because no lastSavedData')
+    } else {
+      isDirty.value = false
+      console.log('[DEBUG Unsaved] Not dirty, data is identical')
     }
   }
   
@@ -20,6 +25,7 @@ export const useUnsavedChanges = () => {
     lastSavedData.value = JSON.stringify(data)
     currentData.value = lastSavedData.value
     isDirty.value = false
+    console.log('[DEBUG Unsaved] Marked as saved, isDirty = false')
   }
   
   // Reset dirty state