Add FPC_SLOT_W param; move FPC and lid params before cutouts

FPC_SLOT_W replaces hardcoded 3 mm in the ceiling slot. FPC params
moved to sit with the Sliding Lid section (before cutout positions)
since they reference LID_T.

cpu_case.scad

@@ -21,6 +21,19 @@ PCB_T =  1.93;   // PCB thickness
 COMP_MAX_Z  = 7.29;   // tallest component (XIAO module)
 COMP_SIDE_Z = 3.82;   // tallest component on +Y wall (buttons, USB-C)
 
+/* [Sliding Lid] */
+LID_T       =  1.5;   // lid ceiling thickness
+FLANGE_H    =  3.0;   // Z height of retention flanges (base + lid); drives lid placement and Y- wall step
+FLANGE_W    =  FLANGE_H * tan(30);   // flange width — 30° from vertical (60° from horizontal), printable without support
+SLIDE_CLEAR =  0.40;  // clearance between flange/rib and groove/channel on all mating faces (0.4 mm suits typical FDM tolerances)
+
+// ---- Y- edge: FPC connector — notch in lid Y+ stop rib ----
+FPC_CX      =  50.0;   // PCB-relative case_x centre
+FPC_NOTCH_W =  20.0;   // notch width for cable routing clearance
+FPC_U_T     = LID_T;   // U-rib arm and bar thickness
+FPC_U_DEPTH =  20.0;   // how far Y- the U arms extend into the lid interior
+FPC_SLOT_W  =   3.0;   // Y depth of ceiling slot the cable exits through
+
 /* [Cutout Positions — from STL geometry, PCB-origin-relative] */
 
 // ---- +Y wall: Sliding power switch ----
@@ -38,12 +51,6 @@ USBC_H          =   3.22;  // port body height from STL
 USBC_CZ         =   4.31;
 USBC_CBL_CLEAR  =   1.5;   // added per side for cable plug + routing clearance
 
-// ---- Y- edge: FPC connector — notch in lid Y+ stop rib ----
-FPC_CX      =  50.0;   // PCB-relative case_x centre
-FPC_NOTCH_W =  20.0;   // notch width for cable routing clearance
-FPC_U_T     =   1.5;   // U-rib arm and bar thickness
-FPC_U_DEPTH =   20.0;   // how far Y- the U arms extend into the lid interior
-
 // ---- +Y wall: 3× user buttons + 1× reset ----
 BTN_CX      = [48.4, 39.075, 29.725, 20.425];   // PCB-relative case_x centres
 BTN_D       =   2.3;   // HOLE_D from hat.scad: PLUNGER_D(2.0) + 2×SLIP_CLEAR(0.15)
@@ -86,12 +93,6 @@ BATT_T   =   6.3;   // 603449 LiPo thickness (Z)
 CLR_BATX =   1.5;   // battery X clearance from X+ wall
 CLR_BATY =   1.5;   // battery Y clearance from Y+ wall
 
-/* [Sliding Lid] */
-LID_T       =  1.5;   // lid ceiling thickness
-FLANGE_H    =  3.0;   // Z height of retention flanges (base + lid); drives lid placement and Y- wall step
-FLANGE_W    =  FLANGE_H * tan(30);   // flange width — 30° from vertical (60° from horizontal), printable without support
-SLIDE_CLEAR =  0.40;  // clearance between flange/rib and groove/channel on all mating faces (0.4 mm suits typical FDM tolerances)
-
 /* [Computed] */
 PCB_Z    = FLOOR + BOSS_H;
 
@@ -293,11 +294,11 @@ module lid() {
             }
         }
 
-        // FPC cable slot — from Y+ face of U-rib bottom bar, 3 mm toward Y+
+        // FPC cable slot — from Y+ face of U-rib bottom bar, FPC_SLOT_W toward Y+
         translate([PCB_OX + FPC_CX - FPC_NOTCH_W/2,
                    LID_Y_LEN - 3 - FPC_U_DEPTH + FPC_U_T,
                    FLANGE_H - 0.1])
-            cube([FPC_NOTCH_W, 3, LID_T + 0.2]);
+            cube([FPC_NOTCH_W, FPC_SLOT_W, LID_T + 0.2]);
     }
 }