frontend: configurable decimal precision, 5 places for azint Q fields

NumberTextField quantized every float input to 3 decimals, so the finest
q_spacing reachable through the UI was 0.001 - capping the azimuthal-integration
q-bin count around 200 regardless of the CPU/FPGA backend. Add an optional
`decimals` prop (default 3, unchanged elsewhere) and set it to 5 on the Q
spacing / Low Q / High Q fields, matching the q_spacing minimum of 1e-5.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/components/AzIntSettings.tsx

@@ -56,6 +56,7 @@ function AzIntSettings({s: serverS}: MyProps) {
                     min={1e-5}
                     units={"A-1"}
                     float={true}
+                    decimals={5}
                     counter={downloadCounter}
                     callback={(val: number, err: boolean) => {
                         setS(prev => ({...prev, q_spacing: val}));
@@ -71,6 +72,7 @@ function AzIntSettings({s: serverS}: MyProps) {
                     max={10.0}
                     units={"A-1"}
                     float={true}
+                    decimals={5}
                     counter={downloadCounter}
                     callback={(val: number, err: boolean) => {
                         setS(prev => ({...prev, low_q_recipA: val}));
@@ -86,6 +88,7 @@ function AzIntSettings({s: serverS}: MyProps) {
                     max={10.0}
                     units={"A-1"}
                     float={true}
+                    decimals={5}
                     counter={downloadCounter}
                     callback={(val: number, err: boolean) => {
                         setS(prev => ({...prev, high_q_recipA: val}));

frontend/src/components/NumberTextField.tsx

@@ -17,7 +17,8 @@ type MyProps = {
     units?: string,
     disabled?: boolean,
     fullWidth?: boolean,
-    float?: boolean
+    float?: boolean,
+    decimals?: number
 }
 
 function unitsNode(str: string | undefined): ReactNode | null {
@@ -33,7 +34,7 @@ function unitsNode(str: string | undefined): ReactNode | null {
         return <InputAdornment position="end">{str}</InputAdornment>;
 }
 
-function NumberTextField({start_val, default: defaultValue, label, callback, counter, min, max, sx, units, disabled, float}: MyProps) {
+function NumberTextField({start_val, default: defaultValue, label, callback, counter, min, max, sx, units, disabled, float, decimals = 3}: MyProps) {
     const [text, setText] = useState(".");
     const [err, setErr] = useState(true);
     const [val, setVal] = useState(0);
@@ -51,7 +52,7 @@ function NumberTextField({start_val, default: defaultValue, label, callback, cou
         if (float !== true)
             v = Math.round(v);
         else
-            v = Math.round(v * 1000.0) / 1000.0
+            v = Number(v.toFixed(decimals));
 
         setErr(false);
         setVal(v);