fix: stop iOS Safari heuristic-caching stale UI pages

User reported 'still broken' on /ui/tags/ai/ right after the 20-card cap
shipped — the deployed HTML was correct (verified in-pod: 20 cards + View
all 363 posts) but Safari was serving a heuristically cached copy of the
previous template. UI HTML responses had no Cache-Control at all.

- core/middleware.NoCacheUiPagesMiddleware: /ui/* HTML → Cache-Control:
  no-cache, no-store, must-revalidate (+ Pragma/Expires). API untouched.
- tag_detail: defensive width:100% + box-sizing on .tags-page/.apple-card

core/middleware.py

@@ -3,6 +3,27 @@ from django.urls import resolve
 from django.utils import translation
 from django.middleware.locale import LocaleMiddleware
 
+
+class NoCacheUiPagesMiddleware:
+    """Never let browsers (esp. iOS Safari's heuristic cache) serve stale UI pages.
+
+    Deployments change templates frequently; without an explicit Cache-Control
+    Safari may cache the HTML heuristically and users keep seeing the previous
+    version even after a fix ships ("did you fix it? still broken"). UI pages
+    are cheap to render; always fetch fresh.
+    """
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        response = self.get_response(request)
+        if request.path.startswith('/ui/') and response.get('Content-Type', '').startswith('text/html'):
+            response['Cache-Control'] = 'no-cache, no-store, must-revalidate'
+            response['Pragma'] = 'no-cache'
+            response['Expires'] = '0'
+        return response
+
+
 class CustomLocaleMiddleware(LocaleMiddleware):
     def process_request(self, request):
         url_path = request.path_info.lstrip('/')

core/settings.py

@@ -190,6 +190,7 @@ LOCALE_INDEPENDENT_PATHS = [
 MIDDLEWARE = [
     'django.middleware.security.SecurityMiddleware',
     'whitenoise.middleware.WhiteNoiseMiddleware',
+    'core.middleware.NoCacheUiPagesMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'core.middleware.CustomLocaleMiddleware',  # 使用自定义中间件
     'django.middleware.common.CommonMiddleware',

links/templates/links/tag_detail.html

@@ -13,12 +13,14 @@
   .tags-page {
     max-width: 1080px; margin: 0 auto; padding: 2rem 1.25rem 3rem;
     color: var(--apple-text);
+    width: 100%; box-sizing: border-box;
   }
   .apple-card {
     background: #fff; border-radius: var(--apple-radius-lg);
     border: 1px solid rgba(0, 0, 0, 0.05);
     box-shadow: 0 4px 18px rgba(0, 0, 0, 0.05);
     padding: 1.5rem; margin-bottom: 1.25rem;
+    width: 100%; box-sizing: border-box;
   }
 
   /* ── Tag header ── */