chore: auto-commit (57 archivos)

- frontend/functions/core/format_datetime_short.md
- frontend/functions/core/format_datetime_short.test.ts
- frontend/functions/core/format_datetime_short.ts
- frontend/functions/core/format_duration.md
- frontend/functions/core/format_duration.test.ts
- frontend/functions/core/format_duration.ts
- frontend/functions/core/month_grid.md
- frontend/functions/core/month_grid.test.ts
- frontend/functions/core/month_grid.ts
- frontend/functions/core/string_hash_palette.md
- ...

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

functions/infra/http_session_token_extract.go

@@ -0,0 +1,19 @@
+package infra
+
+import "net/http"
+
+// SessionTokenExtract extracts a session token from the request.
+// It checks the cookie named cookieName first; if present and non-empty,
+// that value is returned. Otherwise it checks the Authorization header
+// for a "Bearer <token>" prefix and returns the token part.
+// Returns "" if no token is found in either source.
+func SessionTokenExtract(r *http.Request, cookieName string) string {
+	if c, err := r.Cookie(cookieName); err == nil && c.Value != "" {
+		return c.Value
+	}
+	auth := r.Header.Get("Authorization")
+	if len(auth) > 7 && auth[:7] == "Bearer " {
+		return auth[7:]
+	}
+	return ""
+}