fix: remove duplicate bookshelf route and fix template script tags

Remove duplicate /bookshelf route registration that was causing server panic.
The route was registered twice in frontend.go (lines 257-307 removed).

Fix bookshelf.templ script tags:
- Remove malformed Alpine.js CDN path (/static/alpinejs@3.x.x/dist/cdn.min.js)
- Remove standalone bookshelf.js script tag (not built separately)
- Rely on header.templ to load main.js which includes all Alpine components

This fixes the bookshelf page 404 errors and JavaScript errors:
- bookshelf is not defined
- initBookshelf is not defined
- Loading failed for bookshelf.js

The bookshelf page now uses the standard pattern like dashboard and collections:
- Header provides main.js with all Alpine components
- Bookshelf Alpine component registered via x-data="bookshelf"
- All functionality works correctly

internal/router/frontend.go

@@ -254,58 +254,6 @@ func registerFrontendRoutes(cfg *Config) {
 		return c.HTML(http.StatusOK, buf.String())
 	})
 
-	// Bookshelf Page
-	frontendProtected.GET("/bookshelf", func(c *echo.Context) error {
-		user, err := getTemplateUserWithTheme(c, cfg)
-		if err != nil {
-			return renderErrorPage(c, "Error loading user", "user_load_error")
-		}
-
-		var errorMsg string
-
-		// Get library_id from query param or user's first library
-		libraryID := c.QueryParam("library_id")
-		if libraryID == "" {
-			userUUID, _ := uuid.Parse(user.ID)
-			libraries, err := cfg.Queries.GetUserVisibleLibraries(c.Request().Context(), uuidToPGType(userUUID))
-			if err == nil && len(libraries) > 0 {
-				libUUID, _ := uuid.FromBytes(libraries[0].ID.Bytes[0:16])
-				libraryID = libUUID.String()
-			} else {
-				errorMsg = "No libraries available"
-			}
-		}
-
-		// Get libraries for dropdown
-		userUUID, _ := uuid.Parse(user.ID)
-		libraries, err := cfg.Queries.GetUserVisibleLibraries(c.Request().Context(), uuidToPGType(userUUID))
-		if err != nil {
-			log.Printf("GetUserVisibleLibraries failed: %v", err)
-			libraries = []database.GetUserVisibleLibrariesRow{}
-			if errorMsg == "" {
-				errorMsg = "Error loading libraries"
-			}
-		}
-
-		libData := make([]templates.LibraryData, len(libraries))
-		for i, lib := range libraries {
-			libUUID, _ := uuid.FromBytes(lib.ID.Bytes[0:16])
-			libData[i] = templates.LibraryData{
-				ID:          libUUID.String(),
-				Name:        lib.Name,
-				Description: getText(lib.Description),
-				TypeName:    lib.TypeName,
-			}
-		}
-
-		var buf bytes.Buffer
-		err = templates.BookShelf(user, libData, libraryID, errorMsg).Render(c.Request().Context(), &buf)
-		if err != nil {
-			return err
-		}
-		return c.HTML(http.StatusOK, buf.String())
-	})
-
 	// Collections page
 	frontendProtected.GET("/collections", func(c *echo.Context) error {
 		user, err := getTemplateUserWithTheme(c, cfg)