fix: resolve all 15 frontend ESLint errors for green CI

- Replace setState-in-effect with state-based tracking (AdminLayout, EditCategoryModal)
- Convert inline SortIcon component to getSortIcon function (TreeTableView)
- Remove unused catch parameters (CreateCategoryModal, EditCategoryModal)
- Replace `any` types with proper types (SessionFilters, AdminCategoriesPage, SessionHistoryPage)
- Fix unused destructuring variable (StepRatingModal)
- Fix constant binary expression in test (utils.test.ts)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/session/SessionFilters.tsx

@@ -33,11 +33,12 @@ export function SessionFilters({ filters, onChange, onClear, trees }: SessionFil
   const [showDatePicker, setShowDatePicker] = useState(false)
   const [localDateRange, setLocalDateRange] = useState<DateRange | undefined>(filters.dateRange)
 
+  const filtersDateRange = filters.dateRange
   useEffect(() => {
-    setLocalDateRange(filters.dateRange)
-  }, [filters.dateRange])
+    setLocalDateRange(filtersDateRange)
+  }, [filtersDateRange])
 
-  const handleFilterChange = (key: keyof SessionFilterState, value: any) => {
+  const handleFilterChange = (key: keyof SessionFilterState, value: SessionFilterState[keyof SessionFilterState]) => {
     onChange({ ...filters, [key]: value })
   }
 

frontend/src/components/session/StepRatingModal.tsx

@@ -62,7 +62,7 @@ export function StepRatingModal({
   const handleSubmit = async () => {
     // Filter out steps with no rating
     const ratingsToSubmit = new Map(
-      Array.from(ratings.entries()).filter(([_, data]) => data.rating > 0)
+      Array.from(ratings.entries()).filter(([, data]) => data.rating > 0)
     )
 
     if (ratingsToSubmit.size === 0) {