Refactor: Eliminate duplicate types - Use handler types directly

- Deleted templates.CollectionDetailData - using templates.CollectionData everywhere
- Deleted templates.BookData - using handlers.BookInfo everywhere
- Deleted templates.DeviceData - using handlers.DeviceInfo everywhere
- Deleted templates.ProgressItemData - using handlers.ProgressWithMedia everywhere
- Deleted templates.convertDevices() helper - Use handlers types directly in templates
- Enhanced handlers.ProgressWithMedia with device metadata fields
- Added handlers.getDeviceIcon() helper
- Updated all templates to import handlers package
- Cleaned up unused imports

This aligns codebase with templ's design philosophy (use Go types directly, no parallel type system)

templates/types.go

@@ -23,21 +23,6 @@ type CollectionData struct {
 	Icon        string
 }
 
-type CollectionDetailData struct {
-	ID          string
-	Name        string
-	Description string
-	Color       string
-	Icon        string
-}
-
-type BookData struct {
-	MediaItemID    string
-	Title          string
-	Author         string
-	CoverImagePath string
-}
-
 type LibraryData struct {
 	ID          string
 	Name        string
@@ -45,17 +30,6 @@ type LibraryData struct {
 	TypeName    string
 }
 
-type DeviceData struct {
-	ID            string
-	DeviceName    string
-	DeviceType    string
-	SyncEnabled   bool
-	AutoSync      bool
-	SyncFrequency int32
-	LastSync      string
-	LastSeen      string
-}
-
 type PendingRegistrationData struct {
 	RegistrationID string
 	DeviceName     string
@@ -96,21 +70,6 @@ type DeviceShelfMappingData struct {
 	CreatedAt       string
 }
 
-type ProgressItemData struct {
-	MediaItemID        string
-	Title              string
-	Author             string
-	CoverImagePath     string
-	CurrentPage        int32
-	TotalPages         int32
-	ProgressPercentage float64
-	LastUpdated        string
-	DeviceName         string
-	DeviceType         string
-	DeviceIcon         string
-	EpubCFI            string
-}
-
 type UnlinkedBookData struct {
 	ProgressID       string
 	DeviceID         string