fix(database): remove prompt popup, create database inline with default name

Clicking Database button now creates the table directly in the page
without asking for a name (uses 'Database' as default). Same pattern
as Notion: one click, inline embed, no popup.

app/templates/_page_editor_scripts.html

@@ -325,21 +325,20 @@
 
         // ── v4.6.0: Get Started actions ──
         async createDatabase(){
-          const name=prompt('Database name:',this.pageTitle||'New Database');
-          if(!name||!name.trim())return;
           const csrf=document.cookie.match(/csrf_token=([^;]+)/);
           try{
+            const name='Database';
             // Create collection via API
             const r=await fetch('/db/api',{
               method:'POST',headers:{'Content-Type':'application/json','X-CSRF-Token':csrf?csrf[1]:''},
-              body:JSON.stringify({name:name.trim()})
+              body:JSON.stringify({name:name})
             });
             const d=await r.json();
             if(d.id){
               // Add inline database embed block to the page
               this.blocks.push(this.mkB('embed','',{embed_type:'collection',collection_id:d.id}));
               this.render(); this.dirty=true; this.autoSave();
-              this.showToast('Database created: '+d.name);
+              this.showToast('Database created');
             }else{
               this.showToast('Failed to create database');
             }