fix: normalize model pricing display drift (#4985)

web/default/src/features/system-settings/models/pricing-format.ts

@@ -0,0 +1,61 @@
+/*
+Copyright (C) 2023-2026 QuantumNous
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+For commercial licensing, please contact support@quantumnous.com
+*/
+const DISPLAY_DECIMALS = 12
+const SNAP_DECIMALS = 8
+const SNAP_EPSILON = 1e-12
+
+function toNumberOrNull(value: unknown): number | null {
+  if (
+    value === '' ||
+    value === null ||
+    value === undefined ||
+    value === false
+  ) {
+    return null
+  }
+
+  const num = Number(value)
+  return Number.isFinite(num) ? num : null
+}
+
+function roundToDecimals(value: number, decimals: number): number {
+  const factor = 10 ** decimals
+  return Math.round(value * factor) / factor
+}
+
+function snapFloatDrift(value: number): number {
+  const tolerance = Math.max(SNAP_EPSILON, Math.abs(value) * Number.EPSILON * 8)
+
+  for (let decimals = 0; decimals <= SNAP_DECIMALS; decimals += 1) {
+    const rounded = roundToDecimals(value, decimals)
+    if (Math.abs(value - rounded) <= tolerance) {
+      return rounded
+    }
+  }
+
+  return value
+}
+
+export function formatPricingNumber(value: unknown): string {
+  const num = toNumberOrNull(value)
+  if (num === null) return ''
+
+  const normalized = snapFloatDrift(num)
+  return Number.parseFloat(normalized.toFixed(DISPLAY_DECIMALS)).toString()
+}