feat(record-inputs): tap-to-adjust steppers + inputmode keypad hint

Adds [-] / [+] buttons around every numeric input in the Record Inputs
dialog (single-value, dual-entry, and pass_fail+range branches). Tap
to increment / decrement by the recipe-author-derived step size
(stepFor() already computes this from target_min/target_max precision,
falling back to input-type defaults).

- Decrement clamps at 0 (typical qty/time/temp on a plating floor
  doesn't go negative; if needed, operator can still tap the input
  and type a negative value)
- Increment uses _stepRound() to avoid floating-point fuzz on decimals
- Center-aligned monospace-ish input between the buttons for clarity
- inputmode='decimal' (or 'numeric' for time fields) hint so when the
  operator does tap the input, the iPad shows a number keypad instead
  of the full keyboard

Touches single-value, dual-entry (min/max), and pass_fail+range. Other
multi-field widgets (multi-point thickness, bath chemistry panel) still
use plain inputs — separate request if they need steppers too.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating_jobs/static/src/scss/fp_record_inputs_dialog.scss

@@ -801,3 +801,49 @@ $rid-warn        : var(--fp-rid-warn,           #{$_fp-rid-warn-hex});
         color: $rid-required;
     }
 }
+
+// Numeric stepper (tap-to-increment / tap-to-decrement around the input).
+// Operator can still tap the input to open the keypad (inputmode="decimal"
+// gives them the number keypad on iPad).
+.o_fp_ri_stepper {
+    display: flex;
+    align-items: stretch;
+    gap: 0;
+    max-width: 16rem;
+}
+
+.o_fp_ri_stepper_btn {
+    flex: 0 0 auto;
+    width: 3.2rem;
+    border: 1px solid #cdd0d4;
+    background: #f5f6f8;
+    color: #1d1d1f;
+    font-size: 1.3rem;
+    cursor: pointer;
+    transition: background 80ms;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+
+    &:hover, &:active { background: #e5e7eb; }
+
+    &.o_fp_ri_stepper_minus {
+        border-top-left-radius: 6px;
+        border-bottom-left-radius: 6px;
+        border-right: 0;
+    }
+    &.o_fp_ri_stepper_plus {
+        border-top-right-radius: 6px;
+        border-bottom-right-radius: 6px;
+        border-left: 0;
+    }
+}
+
+.o_fp_ri_stepper_input {
+    flex: 1 1 auto;
+    border-radius: 0;
+    text-align: center;
+    font-size: 1.2rem;
+    font-weight: 600;
+    min-width: 4rem;
+}