fix(wechat): add fallback trim profiles for 20k content limit

wechat-daily-news-inline.mjs

@@ -1,7 +1,7 @@
 import { extractPageTitle } from './wechat/verify/share-preview-repair.mjs';
 
 const MAX_WECHAT_CONTENT_CHARS = 20000;
-const MAX_WECHAT_CONTENT_TARGET_CHARS = 19800;
+const MAX_WECHAT_CONTENT_TARGET_CHARS = 19600;
 
 const CARD_VARIANTS = {
   'highlight-box': {
@@ -221,6 +221,33 @@ const TRIM_PROFILES = [
   },
 ];
 
+function buildFallbackTrimProfiles() {
+  const profiles = [];
+  for (let headlines = 3; headlines >= 2; headlines -= 1) {
+    for (let maxBodyChars = 56; maxBodyChars >= 24; maxBodyChars -= 8) {
+      for (const skipWeather of [false, true]) {
+        profiles.push({
+          skipHistory: true,
+          skipWeather,
+          sectionCardLimits: {
+            headlines,
+            world: 2,
+            domestic: 2,
+            google: 1,
+            finance: 2,
+            tech: 2,
+            sports: 1,
+            technews: 0,
+            hot: 0,
+          },
+          maxBodyChars,
+        });
+      }
+    }
+  }
+  return profiles;
+}
+
 function resolveSectionCardLimit(section, sectionCardLimits) {
   if (!sectionCardLimits) return null;
   return sectionCardLimits[section.id] ?? 3;
@@ -238,7 +265,9 @@ function buildWechatInlineContent(html, { publicUrl = '', trimProfile = TRIM_PRO
       continue;
     }
     if (section.id === 'weather') {
-      parts.push(renderWeatherSection(section.html));
+      if (!trimProfile.skipWeather) {
+        parts.push(renderWeatherSection(section.html));
+      }
       continue;
     }
     parts.push(renderGenericSection(section.html, {
@@ -318,10 +347,13 @@ export function convertDailyNewsHtmlToWechatInlineArticle(html, { publicUrl = ''
   const digest = (extractMetaDescription(html) || title).slice(0, 120);
   let built = null;
   let trimLevel = 0;
+  let usedFallback = false;
+  const allProfiles = [...TRIM_PROFILES, ...buildFallbackTrimProfiles()];
 
-  for (const trimProfile of TRIM_PROFILES) {
+  for (const [index, trimProfile] of allProfiles.entries()) {
     built = buildWechatInlineContent(html, { publicUrl, trimProfile });
-    trimLevel = TRIM_PROFILES.indexOf(trimProfile);
+    trimLevel = index;
+    usedFallback = index >= TRIM_PROFILES.length;
     if (built.content.length <= MAX_WECHAT_CONTENT_TARGET_CHARS) {
       break;
     }
@@ -344,6 +376,7 @@ export function convertDailyNewsHtmlToWechatInlineArticle(html, { publicUrl = ''
     renderedSectionCount: built.renderedSectionCount,
     trimLevel,
     trimmed: trimLevel > 0,
+    usedFallbackTrim: usedFallback,
   };
 }