fix: calculate actual progress percentage for continue watching

templates/components/continue_watching.gohtml

@@ -21,10 +21,9 @@
             </div>
           </div>
 
-          {{if .CurrentTimeSeconds}}
-            <!-- Progress calculation would go here if total duration was available -->
+          {{if and .CurrentTimeSeconds .AnimeDurationSeconds.Valid}}
             <div class="bg-foreground-muted/60 absolute bottom-0 left-0 h-1.5 w-full z-20">
-              <div class="shadow-background/20 bg-accent h-full shadow-[0_-2px_5px_0]" style="width: 50%"></div>
+              <div class="shadow-background/20 bg-accent h-full shadow-[0_-2px_5px_0]" style="width: {{percent .CurrentTimeSeconds .AnimeDurationSeconds.Float64}}%"></div>
             </div>
           {{end}}
         </div>

templates/renderer.go

@@ -62,6 +62,21 @@ func GetRenderer() *Renderer {
 			"sub": func(a, b int) int {
 				return a - b
 			},
+			"mul": func(a, b float64) float64 {
+				return a * b
+			},
+			"div": func(a, b float64) float64 {
+				if b == 0 {
+					return 0
+				}
+				return a / b
+			},
+			"percent": func(current, total float64) float64 {
+				if total == 0 {
+					return 0
+				}
+				return (current / total) * 100
+			},
 		}
 
 		pages, err := filepath.Glob(filepath.Join(".", "templates", "*.gohtml"))