feat: edit printer (name, HA prefix, notes) via modal

app.py

@@ -1347,6 +1347,19 @@ def delete_printer(id):
     conn.commit(); conn.close()
     return redirect(url_for('printers_page'))
 
+@app.route('/printers/<int:id>/edit', methods=['POST'])
+@login_required
+def edit_printer(id):
+    name      = request.form.get('name','').strip()
+    ha_prefix = request.form.get('ha_entity_prefix','').strip().lower()
+    notes     = request.form.get('notes','').strip()
+    if name:
+        conn = get_db()
+        conn.execute('UPDATE printers SET name=?, ha_entity_prefix=?, notes=? WHERE id=?',
+                     (name, ha_prefix, notes, id))
+        conn.commit(); conn.close()
+    return redirect(url_for('printers_page'))
+
 @app.route('/working-schedule', methods=['GET','POST'])
 def working_schedule():
     if request.method == 'POST':