Full keyboard: stagger the letter rows like a hardware keyboard

- The ISO key left of Z takes its room from left shift (2.25 → 1.25 + 1),
  so ISO layouts no longer make the shift row the widest
- Caps lock and left shift keep their width; only right-hand keys stretch,
  so A no longer lines up with the key below it

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

layouts/template.json

@@ -88,12 +88,12 @@
                     {"type": "keys", "row": 1}
                 ],
                 [
-                    {"type": "capslock", "label": "caps lock", "width": 1.75, "stretch": true},
+                    {"type": "capslock", "label": "caps lock", "width": 1.75},
                     {"type": "keys", "row": 2},
                     {"type": "enter", "width": 1.75, "stretch": true}
                 ],
                 [
-                    {"type": "shift", "width": 2.25, "stretch": true},
+                    {"type": "shift", "width": 2.25},
                     {"type": "keys", "row": 3},
                     {"type": "shift", "width": 2.25, "stretch": true}
                 ],