Refactor: Recover middleware now uses RenderError + add full notifications view

- Replaced http.Error with helpers.RenderError in Recover middleware
- Custom 500.html now rendered with layout and topbar on panic
- RenderError gracefully checks template existence and falls back to plain response
- Added /account/notifications full view page (index)
- Linked "Back to notifications" from notification read view
- Fixed typo in template path for notifications/index.html
- Improved layout consistency across error and account pages

helpers/template.go

@@ -2,6 +2,7 @@ package helpers
 
 import (
 	"html/template"
+	"log"
 	"net/http"
 	"strings"
 
@@ -69,6 +70,7 @@ func LoadTemplateFiles(name string, files ...string) *template.Template {
 	}
 	all := append(shared, files...)
 
+	log.Printf("📄 Loading templates: %v", all)
 	return template.Must(template.New(name).Funcs(TemplateFuncs()).ParseFiles(all...))
 }