fix: PDF tests data file loading and Chrome installation in CI

- Add findDataFile() helper to search up directory tree for data files
- Fixes tests running from subdirectories (internal/handlers)
- Install Chrome in GitHub Actions for PDF generation tests

This resolves test failures that have existed since PDF tests were introduced:
- Error: 'open data/cv-es.json: no such file or directory'
- Error: 'chrome failed to start'

Tests now properly locate data files from any working directory and
have Chrome available for PDF generation in CI environment.

internal/models/cv.go

@@ -214,6 +214,30 @@ type ShortcutItem struct {
 	Description string `json:"description"`
 }
 
+// findDataFile locates a data file by searching up the directory tree
+func findDataFile(filename string) (string, error) {
+	// Try current directory first
+	if _, err := os.Stat(filename); err == nil {
+		return filename, nil
+	}
+
+	// Try parent directories (for tests running from subdirectories)
+	paths := []string{
+		filename,                   // Current dir
+		"../" + filename,          // One level up
+		"../../" + filename,       // Two levels up (for tests in internal/handlers)
+		"../../../" + filename,    // Three levels up
+	}
+
+	for _, path := range paths {
+		if _, err := os.Stat(path); err == nil {
+			return path, nil
+		}
+	}
+
+	return "", fmt.Errorf("file not found: %s (searched: current dir, ../, ../../, ../../../)", filename)
+}
+
 // LoadCV loads CV data from a JSON file for the specified language
 func LoadCV(lang string) (*CV, error) {
 	if lang != "en" && lang != "es" {
@@ -221,7 +245,12 @@ func LoadCV(lang string) (*CV, error) {
 	}
 
 	filename := fmt.Sprintf("data/cv-%s.json", lang)
-	data, err := os.ReadFile(filename)
+	filepath, err := findDataFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	data, err := os.ReadFile(filepath)
 	if err != nil {
 		return nil, fmt.Errorf("error reading file %s: %w", filename, err)
 	}
@@ -252,7 +281,12 @@ func LoadUI(lang string) (*UI, error) {
 	}
 
 	filename := fmt.Sprintf("data/ui-%s.json", lang)
-	data, err := os.ReadFile(filename)
+	filepath, err := findDataFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	data, err := os.ReadFile(filepath)
 	if err != nil {
 		return nil, fmt.Errorf("error reading file %s: %w", filename, err)
 	}