feat: UI optimizations - button feedback, layout fixes, cache clearing, work/exam records

- Add active: state feedback to all buttons across the app
- Fix cache clearing to update Zustand store (not just localStorage)
- Remove checkboxes from settings cache section, compact layout
- Settings page: single outer scroll instead of dual-column scroll
- CourseWorkspace: elastic log panel height, work/exam record counts
- Integrate WorkList/ExamList types and display in UI
- Delete unused CourseList.tsx component
- Fix wk.ts: strict equality, remove unused import

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

src/components/account/AddAccountDialog.tsx

@@ -43,14 +43,14 @@ const AddAccountDialog = (props: AddAccountDialogProps) => {
         <>
           <button
             type="button"
-            class="rounded-xl border border-zinc-200 px-4 py-2 text-zinc-700 transition hover:bg-zinc-100"
+            class="rounded-xl border border-zinc-200 px-4 py-2 text-zinc-700 transition hover:bg-zinc-100 active:bg-zinc-200"
             onClick={props.onClose}
           >
             取消
           </button>
           <button
             type="button"
-            class="rounded-xl bg-cyan-500 px-4 py-2 text-white transition hover:bg-cyan-600 disabled:cursor-not-allowed disabled:bg-cyan-300"
+            class="rounded-xl bg-cyan-500 px-4 py-2 text-white transition hover:bg-cyan-600 active:bg-cyan-700 disabled:cursor-not-allowed disabled:bg-cyan-300"
             disabled={props.isSubmitting}
             onClick={props.onSubmit}
           >