Optimize case v1.1 with rounded corners and FDM cantilever snaps.

Adds catch windows, locating pegs, and a snap coupon for print tuning; keep lip alignment and rear DHT bay.

Co-authored-by: Cursor <cursoragent@cursor.com>

cad/export/mate.json

@@ -1,8 +1,14 @@
 {
-  "outer_l": 91.5,
-  "outer_w": 55.5,
+  "outer_l": 91.6,
+  "outer_w": 55.599999999999994,
   "front_body_h": 7.2,
   "back_body_h": 10.4,
-  "lip_h": 2.2,
-  "dht_proud": 1.6
+  "lip_h": 2.0,
+  "dht_proud": 1.6,
+  "corner_r": 3.5,
+  "snap_w": 6.5,
+  "snap_l": 11.0,
+  "snap_hook": 0.75,
+  "lip_clear": 0.45,
+  "version": "1.1-snaps"
 }