fix: label tax id as "Tax ID" in the letter head

Text block flex-fills remaining width and right-aligns its text, so it sits at
the document's right edge with or without a company logo. Drop the fixed 500px
width; keep -webkit-box fallbacks for wkhtmltopdf.

default_thai_company/fixtures/letter_head.json

@@ -1,7 +1,7 @@
 [
  {
   "align": "Left",
-  "content": "<style>\n    .bpt-title{\n            display: -webkit-box !important;\n            -webkit-box-align: center !important;\n            -webkit-box-pack: justify !important;\n    }\n</style>\n{% set company = get_letter_head_company(doc) %}\n{% if company %}\n<div class=\"bpt-title\">\n    {% if company.company_logo %}\n    <img alt=\"{{ company.company_name }}\" height=\"125\" src=\"{{ company.company_logo }}\">\n    {% endif %}\n    <div class=\"text-right\" style=\"width: 500px; margin-right: 1px;\">\n        <h1>{{ company.company_name }}</h1>\n        <small>\n            {% if company.tax_id %}<div>ID: {{ company.tax_id }}</div>{% endif %}\n            {% if company.address %}<div>{{ company.address }}</div>{% endif %}\n            {% if company.phone_no %}<div>Phone: {{ company.phone_no }}</div>{% endif %}\n            {% if company.email %}<div>Email: {{ company.email }}</div>{% endif %}\n        </small>\n    </div>\n</div>\n{% endif %}\n",
+  "content": "<style>\n    .bpt-title {\n        display: -webkit-box;\n        display: flex;\n        -webkit-box-align: center;\n        align-items: center;\n        width: 100%;\n    }\n    .bpt-title img {\n        margin-right: 1em;\n    }\n    .bpt-title .bpt-company {\n        -webkit-box-flex: 1;\n        flex: 1;\n        text-align: right;\n    }\n</style>\n{% set company = get_letter_head_company(doc) %}\n{% if company %}\n<div class=\"bpt-title\">\n    {% if company.company_logo %}\n    <img alt=\"{{ company.company_name }}\" height=\"125\" src=\"{{ company.company_logo }}\">\n    {% endif %}\n    <div class=\"bpt-company\">\n        <h1>{{ company.company_name }}</h1>\n        <small>\n            {% if company.tax_id %}<div>Tax ID: {{ company.tax_id }}</div>{% endif %}\n            {% if company.address %}<div>{{ company.address }}</div>{% endif %}\n            {% if company.phone_no %}<div>Phone: {{ company.phone_no }}</div>{% endif %}\n            {% if company.email %}<div>Email: {{ company.email }}</div>{% endif %}\n        </small>\n    </div>\n</div>\n{% endif %}\n",
   "disabled": 0,
   "docstatus": 0,
   "doctype": "Letter Head",
@@ -18,7 +18,7 @@
   "image_width": 0.0,
   "is_default": 1,
   "letter_head_name": "Default Letter Head",
-  "modified": "2026-09-09 17:12:12.886614",
+  "modified": "2026-09-10 09:51:23.933752",
   "name": "Default Letter Head",
   "source": "HTML"
  }