**Add continuous reading mode and enhance accessibility in TheComicReader**

- Introduced a continuous reading mode ("scroll"), allowing users to read without pagination.
- Implemented a toggle in the UI to switch between "paged" and "continuous" modes, with preferences saved in `localStorage`.
- Enhanced keyboard navigation by throttling repeated actions and ignoring irrelevant keypresses during form interactions.
- Integrated `IntersectionObserver` to handle lazy-loading of images and dynamically extending rendered content in continuous mode.
- Updated tests to validate both reading modes, ensuring proper state management and observer handling.
- Adjusted animations and transitions for smoother visual feedback in both modes, respecting users' motion-reduction preferences.

frontend/test/store.test.js

@@ -40,6 +40,30 @@ describe('session state', () => {
   })
 })
 
+describe('reader mode', () => {
+  it('starts in paged mode when nothing is stored', async () => {
+    vi.resetModules()
+    const fresh = (await import('@/store')).default
+
+    expect(fresh.state.reader_mode).toBe('paged')
+  })
+
+  it('keeps the chosen mode in localStorage', () => {
+    store.commit('setReaderMode', 'scroll')
+
+    expect(store.state.reader_mode).toBe('scroll')
+    expect(localStorage.getItem('reader_mode')).toBe('scroll')
+  })
+
+  it('ignores a mode it does not recognise', () => {
+    store.commit('setReaderMode', 'scroll')
+    store.commit('setReaderMode', 'banana')
+
+    expect(store.state.reader_mode).toBe('scroll')
+    expect(localStorage.getItem('reader_mode')).toBe('scroll')
+  })
+})
+
 describe('restoreSession', () => {
   it('refreshes the stored profile from the cookie session', async () => {
     store.commit('updateUser', { id: 1, is_superuser: false })