Add restore functionality for archived messages

- Added `RestoreMessageHandler` and route at `/account/messages/restore`
- Updated `users_messages` table to support `archived_at` reset
- Added restore button to archived messages template
- Ensures archived messages can be moved back into inbox

helpers/pagination.go

@@ -16,3 +16,11 @@ func GetTotalPages(db *sql.DB, tableName, whereClause string, args []interface{}
 	}
 	return totalPages, totalCount
 }
+
+func MakePageRange(current, total int) []int {
+	var pages []int
+	for i := 1; i <= total; i++ {
+		pages = append(pages, i)
+	}
+	return pages
+}

helpers/template.go

@@ -44,6 +44,7 @@ func TemplateFuncs() template.FuncMap {
 		},
 		"mul": func(a, b int) int { return a * b },
 		"add": func(a, b int) int { return a + b },
+		"sub": func(a, b int) int { return a - b },
 		"min": func(a, b int) int {
 			if a < b {
 				return a
@@ -66,6 +67,7 @@ func TemplateFuncs() template.FuncMap {
 			}
 			return s[:max] + "..."
 		},
+		"PageRange": PageRange,
 	}
 }
 
@@ -115,3 +117,11 @@ func rangeClass(n int) string {
 		return "50-plus"
 	}
 }
+
+func PageRange(current, total int) []int {
+	var pages []int
+	for i := 1; i <= total; i++ {
+		pages = append(pages, i)
+	}
+	return pages
+}