feat: add shared validation for chainage and coordinates

src/app/(modules)/segment/components/SegmentDialog.tsx

@@ -182,16 +182,16 @@ export function SegmentDialog({
               <div className="grid gap-4 md:grid-cols-2">
                 <FormField
                   id="segment-start-km"
-                  label="Start (km)"
+                  label="Start Chainage"
                   required
                   error={getError('chainage_start_km')}
                 >
                   <Input
                     id="segment-start-km"
                     type="number"
-                    step="any"
+                    step="1"
                     min="0"
-                    placeholder="0.0"
+                    placeholder="Enter start chainage"
                     aria-invalid={!!getError('chainage_start_km')}
                     {...register('chainage_start_km')}
                   />
@@ -199,16 +199,16 @@ export function SegmentDialog({
 
                 <FormField
                   id="segment-end-km"
-                  label="End (km)"
+                  label="End Chainage"
                   required
                   error={getError('chainage_end_km')}
                 >
                   <Input
                     id="segment-end-km"
                     type="number"
-                    step="any"
+                    step="1"
                     min="0"
-                    placeholder="1.0"
+                    placeholder="Enter end chainage"
                     aria-invalid={!!getError('chainage_end_km')}
                     {...register('chainage_end_km')}
                   />
@@ -312,7 +312,9 @@ export function SegmentDialog({
               Cancel
             </Button>
             <Button type="submit" disabled={isSaving || !canSubmit}>
-              {isSaving ? <Loader2 className="mr-2 size-4 animate-spin" /> : null}
+              {isSaving ? (
+                <Loader2 className="mr-2 size-4 animate-spin" />
+              ) : null}
               {segmentId ? 'Update Segment' : 'Create Segment'}
             </Button>
           </DialogFooter>