Switch all user-facing time displays to 12-hour MM-DD-YYYY format

Consistently format dates and times across all templates and API
handlers using MM-DD-YYYY with 12-hour clock (03:04 PM):

- analytics.go: date keys, lastSync, lastRead timestamps
- progress.go: lastUpdated timestamp in GetAllProgress
- book_detail.templ: LastReadAt, DatePublished
- book_detail_modals.templ: progress sync timestamps, LastReadAt
- devices.templ: LastSync, LastSeen
- conflicts.templ: CreatedAt
- admin_users.templ: user CreatedAt date

internal/handlers/analytics.go

@@ -75,18 +75,18 @@ func (h *AnalyticsHandler) GetReadingStats(c *echo.Context) error {
 	endDate := c.QueryParam("end_date")
 
 	if startDate == "" {
-		startDate = time.Now().AddDate(0, -1, 0).Format("2006-01-02")
+		startDate = time.Now().AddDate(0, -1, 0).Format("01-02-2006")
 	}
 	if endDate == "" {
-		endDate = time.Now().Format("2006-01-02")
+		endDate = time.Now().Format("01-02-2006")
 	}
 
-	startTime, err := time.Parse("2006-01-02", startDate)
+	startTime, err := time.Parse("01-02-2006", startDate)
 	if err != nil {
 		return echo.NewHTTPError(http.StatusBadRequest, "invalid start_date format")
 	}
 
-	endTime, err := time.Parse("2006-01-02", endDate)
+	endTime, err := time.Parse("01-02-2006", endDate)
 	if err != nil {
 		return echo.NewHTTPError(http.StatusBadRequest, "invalid end_date format")
 	}
@@ -130,7 +130,7 @@ func (h *AnalyticsHandler) calculateReadingStats(history []database.GetUserReadi
 				longestSession = int(minutes)
 			}
 
-			dateKey := entry.CreatedAt.Time.Format("2006-01-02")
+			dateKey := entry.CreatedAt.Time.Format("01-02-2006")
 			if dailyMap[dateKey] == nil {
 				dailyMap[dateKey] = &DailyReading{
 					Date: dateKey,
@@ -141,7 +141,7 @@ func (h *AnalyticsHandler) calculateReadingStats(history []database.GetUserReadi
 
 		if entry.PagesRead.Valid {
 			totalPages += int(entry.PagesRead.Int32)
-			dateKey := entry.CreatedAt.Time.Format("2006-01-02")
+			dateKey := entry.CreatedAt.Time.Format("01-02-2006")
 			if dailyMap[dateKey] != nil {
 				dailyMap[dateKey].Pages += int(entry.PagesRead.Int32)
 			}
@@ -222,7 +222,7 @@ func (h *AnalyticsHandler) GetDeviceUsage(c *echo.Context) error {
 		lastSync := ""
 		if u.LastSync != nil {
 			if t, ok := u.LastSync.(time.Time); ok {
-				lastSync = t.Format("2006-01-02 15:04:05")
+				lastSync = t.Format("01-02-2006 03:04:05 PM")
 			}
 		}
 
@@ -274,7 +274,7 @@ func (h *AnalyticsHandler) GetPopularBooks(c *echo.Context) error {
 		lastRead := ""
 		if book.LastRead != nil {
 			if t, ok := book.LastRead.(time.Time); ok {
-				lastRead = t.Format("2006-01-02 15:04:05")
+				lastRead = t.Format("01-02-2006 03:04:05 PM")
 			}
 		}
 

internal/handlers/progress.go

@@ -306,7 +306,7 @@ func (h *Handler) GetAllProgress(c *echo.Context) error {
 
 		lastUpdated := ""
 		if progress.LastReadAt.Valid {
-			lastUpdated = progress.LastReadAt.Time.Format("2006-01-02 15:04")
+			lastUpdated = progress.LastReadAt.Time.Format("01-02-2006 03:04 PM")
 		}
 
 		progressList = append(progressList, ProgressWithMedia{