fix: upgrade playwright-go and fix file:// resource loading

- Upgrade playwright-go v0.5200.1 -> v0.6100.0 (module path changed
  from playwright-community to mxschmitt). The old Azure CDN driver
  download endpoint returns 404 for all versions; v0.6100.0 switches
  to npm registry which works correctly.
- Fix file:// resource loading: replace absolute path src="/..."
  and href="/..." with full URLs so browser can fetch remote
  resources (chapterlog.js) when loading local HTML files.
- Replace removed Devtools field with Args --auto-open-devtools-for-tabs.
- Include error details in playwright install failure log.
- Fix nil pointer in tests: check err before calling SetTextOnly.
- Update all dependencies: goquery, templ, resty, cobra, pflag, etc.
- Bump go toolchain 1.24.2 -> 1.25.0

cmd/download.go

@@ -13,7 +13,7 @@ import (
 	"os"
 	"path/filepath"
 
-	"github.com/playwright-community/playwright-go"
+	"github.com/mxschmitt/playwright-go"
 	"github.com/spf13/cobra"
 )
 
@@ -28,7 +28,7 @@ var downloadCmd = &cobra.Command{
 			Stdout:   io.Discard,
 		})
 		if err != nil {
-			slog.Error("failed to install playwright")
+			slog.Error("failed to install playwright", slog.Any("error", err))
 			return
 		}