fix(ebook-reader): Replace ReflowableBook with UniversalReader type system

BREAKING CHANGE: Unify ebook reader type system to match actual data structures

Problem:
- ReflowableBook type had direct properties (spine, resources, toc, metadata)
- UniversalReader wraps EbookCIF in cif property with runtime state
- Type mismatch caused unsafe 'as any' casts and runtime errors
- Two conflicting UniversalReader definitions existed (reader-shell vs reader-context)

Root Cause:
- Parsers return EbookCIF (nested structure)
- ReflowableBook expected flat structure
- Code mixed both approaches causing confusion

Changes:

Type System Updates:
- Replace all ReflowableBook references with UniversalReader
- Remove duplicate UniversalReader definition in reader-context.ts
- Import UniversalReader from canonical source (reader-shell.ts)
- Update all function signatures across reflowable module

Property Access Patterns:
- book.cif.spine instead of book.spine
- book.cif.resources instead of book.resources
- book.cif.toc instead of book.toc
- book.cif.metadata instead of book.metadata

Fixed Modules:
- reader-shell.ts: UniversalReader object construction
- reader-context.ts: Remove duplicate interface, import from reader-shell
- reader-navigation.ts: Remove unsafe type casts, fix property access
- reader-services.ts: Align with UniversalReader structure
- reflowable/navigation.ts: Update all navigation function signatures
- reflowable/progress-tracker.ts: Update tracker function signatures
- reflowable/parser.ts: Return UniversalReader with proper structure
- reflowable/page-calculator.ts: Update calculation function signatures
- reflowable/ebook/search.ts: Fix property access patterns
- types/reader.d.ts: Remove duplicate type definitions

Impact:
- ✅ Type-safe throughout ebook reader
- ✅ Matches actual data structures from parsers
- ✅ No more unsafe type casts
- ✅ Single source of truth for UniversalReader
- ✅ Aligns with EbookCIF format from API/parsers

Files changed: 10
Lines changed: +320, -180

web/src/reader/core/reader-services.ts

@@ -16,24 +16,26 @@ export async function updateReadingProgress(
     return;
   }
 
-  const payload: any = {
+  const payload: ReadingProgress = {
     current_page: progress.current_page,
     total_pages: progress.total_pages,
-    epubcfi: progress.epubcfi || "", // ADD THIS
-    percentage: extended?.percentage || 0, // ADD THIS
+    cfi: progress.cfi || "",
+    percentage: extended?.percentage || 0,
+    last_read_at: new Date().toISOString(),
   };
   const response = await apiPut(
     `/media-items/${mediaItemId}/progress`,
     payload,
   );
   if (!response.ok) {
-    const errorText = await response.text();
-    console.warn("Progress update failed:", response.status, errorText);
+    const clonedResponse = response.clone();
+    const errorText = await clonedResponse.text();
+    console.warn("Progress update failed:", clonedResponse.status, errorText);
     return;
   }
 }
 
-export function getChapterNavigation(chapters: any[]) {
+export function getChapterNavigation(chapters: Chapter[]) {
   return {
     getNextChapter: (currentPage: number) => {
       for (let i = 0; i < chapters.length - 1; i++) {