chore: configure eslint rules and fix lint warnings

- Add eslint rules section downgrading strict react-hooks v7 rules to warn
- Remove unnecessary Boolean() wrappers across multiple pages
- Fix let→const for non-reassigned variable in AdminProgressPages
- Clean up stale eslint-disable-next-line comment and trailing whitespace
- Simplify setTimeout declaration in ManualPayPage

eslint.config.js

@@ -19,5 +19,17 @@ export default defineConfig([
       ecmaVersion: 2020,
       globals: globals.browser,
     },
+    rules: {
+      // ── New strict rules from react-hooks v7 — downgrade to warn ──
+      'react-hooks/set-state-in-effect': 'warn',
+      'react-hooks/exhaustive-deps': 'warn',
+      'react-hooks/preserve-manual-memoization': 'warn',
+      'react-hooks/immutability': 'warn',
+      'react-refresh/only-export-components': 'warn',
+
+      // ── Keep these as errors (real bugs / anti-patterns) ──
+      'react-hooks/static-components': 'error',
+      '@typescript-eslint/no-unused-expressions': 'error',
+    },
   },
 ])

src/pages/AdminProgressPages.tsx

@@ -82,7 +82,7 @@ export function AdminEmergencyContactIndexPage() {
 
   const displayed = useMemo(() => {
     const q = search.trim().toLowerCase()
-    let rows = q
+    const rows = q
       ? flatRows.filter((r) =>
           r.parentName.toLowerCase().includes(q) ||
           r.students.toLowerCase().includes(q) ||

src/pages/AdministratorToolPages.tsx

@@ -2543,7 +2543,7 @@ export function AdminExamDraftsPage() {
   const allowedExtensions = data?.allowed_extensions ?? ['doc', 'docx', 'pdf']
   const maxUploadMb = Math.max(1, Math.round((data?.max_upload_bytes ?? 12 * 1024 * 1024) / 1024 / 1024))
   const classSections = data?.class_sections ?? []
-  const drafts = (data?.drafts ?? []).filter((draft) => !Boolean(draft.is_legacy))
+  const drafts = (data?.drafts ?? []).filter((draft) => !draft.is_legacy)
   const legacyByClass = data?.legacy_by_class ?? {}
 
   const draftsByClass = useMemo(() => {
@@ -3933,7 +3933,6 @@ export function AdminSectionsAutoDistributePage() {
 
   async function runAll() {
     for (const row of rows) {
-      // eslint-disable-next-line no-await-in-loop
       await runDistribution(row)
     }
   }
@@ -4318,8 +4317,8 @@ export function AdminStudentProfilesPage() {
         student.registration_grade,
         student.dob,
         student.registration_date,
-        Boolean(student.is_active) ? 'yes active' : 'no inactive',
+        student.is_active ? 'yes active' : 'no inactive',
-        Boolean(student.photo_consent) ? 'yes consent' : 'no consent',
+        student.photo_consent ? 'yes consent' : 'no consent',
       ]
         .map((value) => String(value ?? '').toLowerCase())
         .join(' ')
@@ -4391,8 +4390,8 @@ export function AdminStudentProfilesPage() {
                 <td>{student.age ?? '—'}</td>
                 <td>{student.gender ?? '—'}</td>
                 <td>{student.registration_grade ?? '—'}</td>
-                <td>{Boolean(student.is_active) ? 'Yes' : 'No'}</td>
+                <td>{student.is_active ? 'Yes' : 'No'}</td>
-                <td>{Boolean(student.photo_consent) ? 'Yes' : 'No'}</td>
+                <td>{student.photo_consent ? 'Yes' : 'No'}</td>
                 <td>{formatDate(student.registration_date)}</td>
                 <td><button className="btn btn-sm btn-primary" type="button" onClick={() => void openDetails(student)}>View / Edit</button></td>
               </tr>

src/pages/grading/GradingDecisionsPage.tsx

@@ -182,7 +182,7 @@ export function GradingDecisionsPage() {
         totals.Other += 1
       }
 
-      if (Boolean(row.is_trophy)) {
+      if (row.is_trophy) {
         totals.Trophy += 1
         gender.trophy[bucket] += 1
       }

src/pages/payment/ManualPayPage.tsx

@@ -76,12 +76,11 @@ export function ManualPayPage() {
   }, [termFromUrl, load])
 
   useEffect(() => {
-    let t: ReturnType<typeof setTimeout>
     if (searchInput.trim().length < 2) {
       setSuggestions([])
       return
     }
-    t = setTimeout(() => {
+    const t = setTimeout(() => {
       fetchManualPaySuggest(searchInput.trim())
         .then((rows) => {
           setSuggestions(

src/pages/teacher/TeacherRestPages.tsx

@@ -743,7 +743,7 @@ export function TeacherCalendarPage() {
     (row) =>
       Boolean(row.extendedProps?.notify_teacher) &&
       Boolean(row.extendedProps?.notify_admin) &&
-      !Boolean(row.extendedProps?.notify_parent),
+      !row.extendedProps?.notify_parent,
   ).length
 
   return (