fix: update decimal input to allow any step value and improve model value handling

Author: kulikp1

adminforth/spa/src/components/ColumnValueInput.vue

@@ -99,8 +99,9 @@
       :fullWidth="true"
       :prefix="column.inputPrefix"
       :suffix="column.inputSuffix"
+      :readonly="(column.editReadonly && source === 'edit') || readonly"      
       :modelValue="value?.toString().replace(/(\.[0-9]*[1-9])0+$|\.0+$/, '$1')"
-      @update:modelValue="$emit('update:modelValue', $event)"
+      @update:modelValue="(val: string | number) => $emit('update:modelValue', val !== null ? String(val) : '')"
     />
     <Input
       v-else-if="(type || column.type) === 'float'"