fix: add Array.isArray guard to section reset in config module

The single-section reset branch used `typeof sectionData === 'object'`
to validate before in-place mutation, but arrays pass that check. Added
`!Array.isArray(sectionData)` to prevent array data from being treated
as a plain object during reset, which would corrupt it via
Object.keys/delete/Object.assign.

Author: BillChirico

src/modules/config.js

@@ -230,7 +230,7 @@ export async function resetConfig(section) {
 
     // Mutate in-place so references stay valid (deep clone to avoid shared refs)
     const sectionData = configCache[section];
-    if (sectionData && typeof sectionData === 'object') {
+    if (sectionData && typeof sectionData === 'object' && !Array.isArray(sectionData)) {
       for (const key of Object.keys(sectionData)) delete sectionData[key];
       Object.assign(sectionData, structuredClone(fileConfig[section]));
     } else {