fix(sqlite): backfill description_data_full & fix manage_prompt UI

backend/static/manage_prompt/manage_prompt.css

@@ -740,8 +740,8 @@ body {
 .diff-output-side {
   display: grid;
   grid-template-columns: 1fr 1fr;
-  height: 100%;
-  min-height: 0;
+  min-height: 300px;
+  height: 55vh;
 }
 .diff-pane {
   display: flex;
@@ -773,7 +773,8 @@ body {
 .diff-output-unified {
   display: flex;
   flex-direction: column;
-  height: 100%;
+  min-height: 300px;
+  height: 55vh;
 }
 .diff-unified-header {
   padding: 10px 16px;

backend/static/manage_prompt/manage_prompt.js

@@ -354,34 +354,74 @@ let diffViewMode = 'side'; // 'side' | 'unified'
 let lastDiffData = null;   // cache for view toggle
 
 async function openDiffModal(moduleName) {
-    const mod = modules.find(m => m.module_name === moduleName);
-    if (!mod || !mod.dev || !mod.production) return;
+    try {
+        const mod = modules.find(m => m.module_name === moduleName);
+        if (!mod || !mod.dev || !mod.production) {
+            toast('Module không có cả DEV và PRODUCTION để so sánh', 'error');
+            return;
+        }
 
-    document.getElementById('diff-title').textContent = `So sánh: ${moduleName}`;
-    document.getElementById('btn-promote-modal').onclick = () => {
-        closeDiffModal();
-        promoteVersion(mod.dev.id, moduleName);
-    };
+        document.getElementById('diff-title').textContent = `So sánh: ${moduleName}`;
+        document.getElementById('btn-promote-modal').onclick = () => {
+            closeDiffModal();
+            promoteVersion(mod.dev.id, moduleName);
+        };
 
-    const [devC, prodC] = await Promise.all([
-        fetchContent(mod.dev.id),
-        fetchContent(mod.production.id),
-    ]);
+        const [devC, prodC] = await Promise.all([
+            fetchContent(mod.dev.id),
+            fetchContent(mod.production.id),
+        ]);
 
-    const devText = devC || '';
-    const prodText = prodC || '';
+        const devText = devC || '';
+        const prodText = prodC || '';
 
-    // Compute diff using jsdiff
-    const changes = Diff.diffLines(devText, prodText);
-    lastDiffData = { changes, devText, prodText, devV: mod.dev.version, prodV: mod.production.version };
+        // Compute diff — use jsdiff if available, else fallback
+        let changes;
+        if (typeof Diff !== 'undefined' && Diff.diffLines) {
+            changes = Diff.diffLines(devText, prodText);
+        } else {
+            console.warn('jsdiff not loaded, using fallback diff');
+            changes = fallbackDiff(devText, prodText);
+        }
 
-    // Update char counts
-    document.getElementById('ds-dev-chars').textContent = devText.length.toLocaleString();
-    document.getElementById('ds-prod-chars').textContent = prodText.length.toLocaleString();
+        lastDiffData = { changes, devText, prodText, devV: mod.dev.version, prodV: mod.production.version };
 
-    renderDiff();
-    document.getElementById('diff-modal').classList.add('open');
-    lucide.createIcons();
+        // Update char counts
+        document.getElementById('ds-dev-chars').textContent = devText.length.toLocaleString();
+        document.getElementById('ds-prod-chars').textContent = prodText.length.toLocaleString();
+
+        renderDiff();
+        document.getElementById('diff-modal').classList.add('open');
+        lucide.createIcons();
+    } catch (err) {
+        console.error('Diff modal error:', err);
+        toast('❌ Lỗi mở Compare: ' + err.message, 'error');
+    }
+}
+
+// Fallback diff when jsdiff CDN fails
+function fallbackDiff(oldText, newText) {
+    const oldLines = oldText.split('\n');
+    const newLines = newText.split('\n');
+    const result = [];
+    const maxLen = Math.max(oldLines.length, newLines.length);
+
+    for (let i = 0; i < maxLen; i++) {
+        const ol = oldLines[i];
+        const nl = newLines[i];
+
+        if (ol === nl) {
+            result.push({ value: ol + '\n', added: false, removed: false });
+        } else {
+            if (ol !== undefined) {
+                result.push({ value: ol + '\n', added: false, removed: true });
+            }
+            if (nl !== undefined) {
+                result.push({ value: nl + '\n', added: true, removed: false });
+            }
+        }
+    }
+    return result;
 }
 
 function setDiffView(mode) {