refactor(reader): add supporting changes for pagination system

Supporting updates for the new page-based pagination architecture:

settings-manager.ts:
- Export loadSettings function for use in reader initialization
- Allow external modules to access user reading preferences

gestures.ts:
- Update import paths for panel detection modules
- Reflect new format-specific directory structure

types/reader.d.ts:
- Add saved_progress field to ReaderMetadata interface
- Include current_page, cfi, and progress fields
- Enable type-safe access to restored reading position

These changes enable the pagination system to access user
settings and properly type restored progress data.

web/src/types/reader.d.ts

@@ -84,6 +84,11 @@ interface ReaderMetadata {
   file_path: string;
   chapter_metadata?: ChapterMetadata;
   total_pages?: number;
+  saved_progress?: {
+    current_page?: number;
+    cfi?: string;
+    progress?: number;
+  };
 }
 
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