feat(feedback): Add content improvement feedback system

Frontend (frontend/app.js):

- Add textarea for improvement feedback

- Add submit button with loading state

- Handle API response and display improved content

Backend (backend/copywriter.py):

- Add improve_copy() method using Cohere API

- Integrate retry mechanism for API calls

Backend (backend/main.py):

- Add /improve-content POST endpoint

- Implement error handling and return improved content with metadata

Testing:

- Verified feedback submission flow

- Confirmed improved content generation

- Tested error scenarios and loading states

data/style_guidelines/brand_style.json

@@ -1,12 +1,9 @@
 {
-  "brand_name": "Adriana James",
   "tone": [
     "professional",
     "friendly",
     "inspirational",
-    "empowering",
-    "excited",
-    "authoritative"
+    "empowering"
   ],
   "voice_characteristics": [
     "clear",
@@ -14,9 +11,13 @@
     "empowering",
     "confident",
     "authentic",
-    "innovative",
-    "visionary",
-    "approachable"
+    "innovative"
+  ],
+  "writing_patterns": [
+    "direct commands",
+    "personal pronouns",
+    "repetitive rhythms",
+    "empowering phrases"
   ],
   "taboo_words": [
     "cheap",
@@ -32,5 +33,6 @@
     "problems": "challenges",
     "services": "experiences",
     "training": "transformation"
-  }
+  },
+  "brand_name": "Adriana James"
 }