refactor: Simplify reading progress parameters for foliate-js integration

Remove unused Epubcfi and Percentage fields from UpdateReadingProgressParams
struct to align with the new foliate-js based reader implementation.

The foliate-js library handles CFI tracking and percentage calculation
internally, so these parameters are no longer needed in the update API.
The reader now relies on foliate-js's built-in progress tracking mechanisms.

This change aligns the database layer with the foliate-js integration completed
in commit c7a9098 (feat: Replace foliate-js submodule with npm git dependency).

Changes:
- Remove Epubcfi field from UpdateReadingProgressParams struct
- Remove Percentage field from UpdateReadingProgressParams struct
- UpdateReadingProgress function now uses simplified parameter set

internal/database/queries.sql.go

@@ -9579,8 +9579,6 @@ type UpdateReadingProgressParams struct {
 	UserID      pgtype.UUID `db:"user_id" json:"user_id"`
 	CurrentPage pgtype.Int4 `db:"current_page" json:"current_page"`
 	TotalPages  pgtype.Int4 `db:"total_pages" json:"total_pages"`
-	Epubcfi     string      `json:"epubcfi"`
-	Percentage  float64     `json:"percentage"`
 }
 
 func (q *Queries) UpdateReadingProgress(ctx context.Context, arg UpdateReadingProgressParams) (ReadingProgress, error) {