fix: Apply active filters to chapter count display (Closes #1793)

[Definisi]

Fixes #1793

When filtering chapters (e.g. showing only unread), the chapter count in the novel header kept showing the total instead of the filtered count.

Root cause:
getChapterCount in ChapterQueries.ts only accepted novelId and page, with no way to pass the active filter. Meanwhile getPageChaptersBatched (which fetches the actual chapter list) was correctly applying filters via chapterFilterToSQL.

What changed:

• Added an optional filter parameter to getChapterCount and applied chapterFilterToSQL in the count query
• Updated both call sites in useNovel.ts to pass the current settingsFilter

The reader's useChapter.ts also calls getChapterCount (to check if a next/prev page has chapters), but those calls intentionally stay unfiltered since the reader should still allow navigating across all chapters.

Testing:

• All 31 existing tests pass
• No new type errors introduced

[CD-Z]

Please fix the lint warnings in useNovel and tests for the filter behavior.

[Definisi]

Fixed in e05a70b:

• Lint: the react-hooks/exhaustive-deps warning on getChapters was because novelSettings.filter was used on line 274 instead of settingsFilter (same value, different reference). Swapped to settingsFilter so it matches the dep array.

• Tests: added two test cases for getChapterCount with filters:

  • should return filtered count when filter is provided (verifies not-read and read filters return correct counts)
  • should return total count when no filter is provided (verifies undefined and [] both return total)

  Also updated chapterFilterToSQL mock in setup.ts to actually apply SQL conditions instead of always returning undefined, so the filter tests can work.

All 201 tests passing.