fix: add camera node USB power ports

hardware/case/camera-node-case-v4.scad

@@ -12,6 +12,8 @@
 // - Small rocker switch cutout: 13 x 19 mm rectangular snap-in opening.
 // - LEDs: two 3 mm panel LEDs (PWR + RGB STAT) with 3.2 mm holes.
 // - Boards: ESP32-C3 Super Mini 22.5 x 18 mm, ESP-01S 24.7 x 14.3 x 12 mm.
+// - USB-C bottom power inlet and side USB-A passthrough are panel/breakout placeholders;
+//   measure purchased connector flanges/bodies before production prints.
 
 $fn = 56;
 
@@ -57,9 +59,16 @@ strap_bridge_y = strap_gap_y + 2.4;
 strap_z1 = 23.0;
 strap_z2 = 50.0;
 
-// Cable exit
-cable_notch_w = 13.0;
-cable_notch_h = 6.5;
+// USB power connector placeholder cutouts
+usb_c_cutout_w = 10.5;        // bottom USB-C female inlet visible opening, X width
+usb_c_cutout_d = 4.5;         // bottom USB-C female inlet visible opening, Y/front-back
+usb_c_recess_w = 18.0;        // shallow underside panel-mount/breakout recess
+usb_c_recess_d = 10.0;
+usb_c_y = -7.5;               // close to front/service side but clear of screw bosses/lower slots
+usb_a_cutout_d = 16.0;        // side USB-A female opening, Y/front-back dimension
+usb_a_cutout_h = 8.0;         // side USB-A female opening, Z height
+usb_a_z = 26.0;               // mid/lower right side, clear of front lid screws/strap bridges
+usb_a_y = 2.0;
 
 // ----- Utility geometry -----
 module rounded_box(size=[10,10,10], r=2, center_xy=true) {
@@ -77,6 +86,15 @@ module xz_rounded_prism(w, d, h, r=2) {
                 square([w-2*r, h-2*r], center=true);
 }
 
+module yz_rounded_prism(d, x, h, r=2) {
+    // Rounded rectangle in the visible Y/Z plane, extruded through X.
+    // First argument maps to global Y, third argument maps to global Z.
+    rotate([0,90,0])
+        linear_extrude(height=x, center=true)
+            offset(r=r)
+                square([h-2*r, d-2*r], center=true);
+}
+
 module y_cylinder(d, h, center=true) {
     rotate([90,0,0]) cylinder(d=d, h=h, center=center);
 }
@@ -138,9 +156,16 @@ module camera_node_body_v4() {
                 translate([0, -case_d/2 + front_recess_d + wall + cavity_d/2, case_h/2])
                     cube([case_w - 2*wall, cavity_d, case_h - 2*wall], center=true);
 
-                // Bottom center cable exit / strain-relief notch.
-                translate([0, -case_d/2 + 2.0, -0.05])
-                    xz_rounded_prism(cable_notch_w, 9.0, cable_notch_h, r=1.8);
+                // Bottom USB-C female power inlet: shallow underside recess plus
+                // rounded through-slot for a flush/panel-mount breakout placeholder.
+                translate([0, usb_c_y, -0.35])
+                    rounded_box([usb_c_recess_w, usb_c_recess_d, 0.9], r=1.5);
+                translate([0, usb_c_y, -0.2])
+                    rounded_box([usb_c_cutout_w, usb_c_cutout_d, wall + 1.2], r=1.6);
+
+                // Right-side USB-A female passthrough power port for the GoPro.
+                translate([case_w/2 - 0.10, usb_a_y, usb_a_z])
+                    yz_rounded_prism(usb_a_cutout_d, wall + 2.8, usb_a_cutout_h, r=0.9);
             }
 
             // Four protected screw bosses are added after shell hollowing so the
@@ -193,11 +218,6 @@ module camera_node_lid_v4() {
         translate([0, panel_through_y, 33.0])
             xz_rounded_prism(rocker_w, panel_through_d, rocker_h, r=0.8);
 
-        // Bottom-center cable relief in the removable front panel so the cable
-        // exit is obvious and not visually hidden by the service lid.
-        translate([0, panel_through_y, 0.8])
-            xz_rounded_prism(cable_notch_w, panel_through_d, cable_notch_h, r=1.8);
-
         // Two long rounded horizontal slots near the lower front, matching the reference.
         translate([0, panel_through_y, 17.0])
             xz_rounded_prism(front_slot_w, panel_through_d, front_slot_h, r=front_slot_h/2 - 0.15);
@@ -227,16 +247,18 @@ module camera_node_preview_v4(show_lid=true) {
         translate([0, -case_d/2 - 0.08, (case_h - lid_h)/2 + oled_z])
             color("black") xz_rounded_prism(oled_bezel_w, 0.6, oled_bezel_h, r=1.3);
 
-    // Internal board volume guides (not printed): ESP32-C3 and ESP-01S envelopes.
+    // Internal board/connector volume guides (not printed): ESP modules and USB connector envelopes.
     color([0,0.45,0,0.35]) translate([-9, -1, 26]) cube([22.5, 18, 4], center=true);
     color([0,0.2,0.8,0.35]) translate([9, -1, 45]) cube([24.7, 14.3, 12], center=true);
+    color([0.1,0.1,0.1,0.35]) translate([0, usb_c_y, 3.8]) cube([16, 9, 5], center=true);
+    color([0.1,0.1,0.1,0.35]) translate([case_w/2 - 5.5, usb_a_y, usb_a_z]) cube([11, usb_a_cutout_d + 2, usb_a_cutout_h + 2], center=true);
 }
 
 // Non-print review layout: separates the body and front lid while keeping both
 // front faces oriented toward -Y. Use this STL when checking that the screen,
-// LED, rocker, cable, and lower-slot cutouts are visible in a slicer.
+// LED, rocker, USB connector, and lower-slot cutouts are visible in a slicer.
 module camera_node_front_review_v4() {
-    translate([-34, 0, 0]) color("lightgray") camera_node_body_v4();
+    translate([-34, 0, 0]) rotate([0,0,-18]) color("lightgray") camera_node_body_v4();
     translate([34, -case_d/2 + lid_t/2 + 0.03, (case_h - lid_h)/2])
         color("gainsboro") camera_node_lid_v4();
 }