feat: Complete HTML-first architecture implementation with API integration

- Replace value field with html_content for direct HTML storage
- Add original_template field for style detection preservation
- Remove all markdown processing from injector (delete markdown.go)
- Fix critical content extraction/injection bugs in engine
- Add missing UpdateContent PUT handler for content persistence
- Fix API client field names and add updateContent() method
- Resolve content type validation (only allow text/link types)
- Add UUID-based ID generation to prevent collisions
- Complete first-pass processing workflow for unprocessed elements
- Verify end-to-end: Enhancement → Database → API → Editor → Persistence

All 37 files updated for HTML-first content management system.
Phase 3a implementation complete and production ready.

lib/package-lock.json

@@ -8,10 +8,6 @@
       "name": "@insertr/lib",
       "version": "1.0.0",
       "license": "MIT",
-      "dependencies": {
-        "marked": "^16.2.1",
-        "turndown": "^7.2.1"
-      },
       "devDependencies": {
         "@rollup/plugin-node-resolve": "^15.0.0",
         "@rollup/plugin-terser": "^0.4.0",
@@ -68,12 +64,6 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
-    "node_modules/@mixmark-io/domino": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/@mixmark-io/domino/-/domino-2.2.0.tgz",
-      "integrity": "sha512-Y28PR25bHXUg88kCV7nivXrP2Nj2RueZ3/l/jdx6J9f8J4nsEGcgX0Qe6lt7Pa+J79+kPiJU3LguR6O/6zrLOw==",
-      "license": "BSD-2-Clause"
-    },
     "node_modules/@rollup/plugin-node-resolve": {
       "version": "15.3.1",
       "resolved": "https://registry.npmjs.org/@rollup/plugin-node-resolve/-/plugin-node-resolve-15.3.1.tgz",
@@ -264,18 +254,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/marked": {
-      "version": "16.2.1",
-      "resolved": "https://registry.npmjs.org/marked/-/marked-16.2.1.tgz",
-      "integrity": "sha512-r3UrXED9lMlHF97jJByry90cwrZBBvZmjG1L68oYfuPMW+uDTnuMbyJDymCWwbTE+f+3LhpNDKfpR3a3saFyjA==",
-      "license": "MIT",
-      "bin": {
-        "marked": "bin/marked.js"
-      },
-      "engines": {
-        "node": ">= 20"
-      }
-    },
     "node_modules/path-parse": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.7.tgz",
@@ -434,15 +412,6 @@
       "engines": {
         "node": ">=10"
       }
-    },
-    "node_modules/turndown": {
-      "version": "7.2.1",
-      "resolved": "https://registry.npmjs.org/turndown/-/turndown-7.2.1.tgz",
-      "integrity": "sha512-7YiPJw6rLClQL3oUKN3KgMaXeJJ2lAyZItclgKDurqnH61so4k4IH/qwmMva0zpuJc/FhRExBBnk7EbeFANlgQ==",
-      "license": "MIT",
-      "dependencies": {
-        "@mixmark-io/domino": "^2.2.0"
-      }
     }
   }
 }

lib/src/core/api-client.js

@@ -33,7 +33,7 @@ export class ApiClient {
         try {
             const payload = {
                 html_markup: htmlMarkup,  // Always send HTML markup - server extracts ID or generates new one
-                value: content,
+                html_content: content,
                 type: type,
                 file_path: this.getCurrentFilePath()  // Always include file path for consistent ID generation
             };
@@ -66,6 +66,40 @@ export class ApiClient {
         }
     }
 
+    async updateContent(contentId, content) {
+        try {
+            const payload = {
+                html_content: content
+            };
+            
+            const response = await fetch(`${this.baseUrl}/${contentId}?site_id=${this.siteId}`, {
+                method: 'PUT',
+                headers: {
+                    'Content-Type': 'application/json',
+                    'Authorization': `Bearer ${this.getAuthToken()}`
+                },
+                body: JSON.stringify(payload)
+            });
+            
+            if (response.ok) {
+                const result = await response.json();
+                console.log(`✅ Content updated: ${contentId}`);
+                return result;
+            } else {
+                console.warn(`⚠️ Update failed (${response.status}): ${contentId}`);
+                return false;
+            }
+        } catch (error) {
+            if (error.name === 'TypeError' && error.message.includes('fetch')) {
+                console.warn(`🔌 API Server not reachable at ${this.baseUrl}`);
+                console.warn('💡 Start full-stack development: just dev');
+            } else {
+                console.error('Failed to update content:', contentId, error);
+            }
+            return false;
+        }
+    }
+
     async getContentVersions(contentId) {
         try {
             const response = await fetch(`${this.baseUrl}/${contentId}/versions?site_id=${this.siteId}`);

lib/src/core/insertr.js

@@ -134,24 +134,13 @@ export class InsertrCore {
     detectContentType(element) {
         const tag = element.tagName.toLowerCase();
         
-        if (element.classList.contains('insertr-group')) {
-            return 'group';
+        // Only return database-valid types: 'text' or 'link'
+        if (tag === 'a' || tag === 'button') {
+            return 'link';
         }
         
-        switch (tag) {
-            case 'h1': case 'h2': case 'h3': case 'h4': case 'h5': case 'h6':
-                return 'text';
-            case 'p':
-                return 'textarea';
-            case 'a': case 'button':
-                return 'link';
-            case 'div': case 'section':
-                return 'text';
-            case 'span':
-                return 'text';
-            default:
-                return 'text';
-        }
+        // All other elements are text content
+        return 'text';
     }
     
     // Get all elements with their metadata, including group elements