fix: fall back to Redux lastReadVerse for Continue Reading surah (#3210)

[Mubashir78]

Fixes #3210

Summary

When a logged-in user navigates to a Surah and then returns to the dashboard, the "Continue Reading" card sometimes shows the wrong Surah (the previously read one instead of the current one).

Root Cause

The dashboard reading section uses a priority chain to resolve the surah shown:

1. Server-side reading bookmark (verse-level)
2. Server-side reading bookmark (page-level)
3. Server-side reading sessions (via useSWRImmutable)

The server-side reading sessions are updated by a debounced API call (addReadingSession) triggered by the intersection observer, which fires only when the user scrolls. Additionally, useSWRImmutable does not re-fetch after the cache is invalidated, so the dashboard may serve stale session data.

The Redux lastReadVerse (via useSyncChapterPage) is updated immediately on every navigation but was not included in the priority chain.

Fix

Added lastReadVerse.chapterId and the corresponding verse number as a fallback in the priority chain, between the server-side reading sessions and the hardcoded default of Surah 1. This ensures the locally-tracked last read verse is used when the server data is stale or unavailable.

Testing

• Verified the priority chain correctly resolves via effectiveAyahVerseKey → firstVerseOfStoredPage → recentlyReadVerseKeys → lastReadVerse → default 1.
• The change is minimal (2 lines added to the priority chain, 1 selector import, 1 useSelector call).
• All existing render paths (guest, logged-in, first-time, mobile) are unchanged.

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