fix: invalidate series cache when book status changes (#409)

## Summary

Fixes a cache invalidation bug where changing a book's status on
`/books/:id` doesn't refresh the cache on the `/series/:name` page,
causing stale status badges and ratings to be displayed.

## Root Cause

The cache invalidation bug existed at two levels:

1. **Client-Side (React Query)**: `invalidateBookQueries()` in
`useBookStatus.ts` was not invalidating series queries
2. **Server-Side (Next.js)**: `SessionService` and `ProgressService`
were not calling `revalidatePath('/series')`

## Changes

**3 files modified, 3 lines added:**

- `hooks/useBookStatus.ts:57` - Added series query invalidation using
`queryKeys.series.all()`
- `lib/services/session.service.ts:1365` - Added
`revalidatePath('/series')`
- `lib/services/progress.service.ts:524` - Added
`revalidatePath('/series')`

## Implementation Details

The fix uses "nuclear" invalidation (invalidate all series queries) for
simplicity and reliability, consistent with the existing shelf
invalidation pattern when specific targeting is complex.

- `queryKeys.series.all()` returns `['series']`, which matches both
series list and all series detail pages
- `revalidatePath('/series')` revalidates both `/series` (list) and
`/series/:name` (detail) pages

## Testing

- ✅ All 4,013 tests pass (188 test files)
- ✅ No regressions detected
- ✅ Changes follow existing patterns

## Manual Testing

To verify the fix:
1. Open a series detail page (e.g., `/series/Harry%20Potter`)
2. Note a book's status badge
3. Change that book's status on `/books/:id`
4. Return to the series page - status should now update immediately

Author: masonfox

hooks/useBookStatus.ts

@@ -54,6 +54,9 @@ export function invalidateBookQueries(queryClient: QueryClient, bookId: string):
   queryClient.invalidateQueries({ queryKey: queryKeys.dashboard.all() });
   queryClient.invalidateQueries({ queryKey: queryKeys.library.books() });
   queryClient.invalidateQueries({ queryKey: queryKeys.readNext.base() });
+  
+  // Invalidate series pages (if book belongs to a series)
+  queryClient.invalidateQueries({ queryKey: queryKeys.series.all() });
 
   // Invalidate shelves containing this book
   // Try to get shelves from cache; if available, invalidate only those shelves (surgical)

lib/services/progress.service.ts

@@ -521,6 +521,7 @@ export class ProgressService {
       revalidatePath("/stats"); // Stats page
       revalidatePath("/journal"); // Journal page
       revalidatePath(`/books/${bookId}`); // Book detail page
+      revalidatePath("/series"); // Series pages (list and detail)
     } catch (error) {
       getLogger().error({ err: error }, "[ProgressService] Failed to invalidate cache");
       // Don't fail the request if cache invalidation fails

lib/services/session.service.ts

@@ -1362,6 +1362,7 @@ export class SessionService {
       revalidatePath("/stats"); // Stats page
       revalidatePath("/journal"); // Journal page
       revalidatePath(`/books/${bookId}`); // Book detail page
+      revalidatePath("/series"); // Series pages (list and detail)
     } catch (error) {
       getLogger().error({ err: error }, "[SessionService] Failed to invalidate cache");
       // Don't fail the request if cache invalidation fails