fix: move language selector global + fix diagnosis prompt echo bug

- Language dropdown moved above main content row (global selector)
- Prompt now explicitly instructs model to return a clinical condition
name (e.g. 'Contact Dermatitis'), not a restatement of symptoms
- Fixes VI/other language diagnosis echoing patient description

app.py

@@ -382,6 +382,16 @@ with gr.Blocks(css=CSS, theme=gr.themes.Base(), title="MediVision — AMD MI300X
 
     gr.HTML(HEADER_HTML)
 
+    # ── Global language selector ──────────────────────────────────────────────
+    with gr.Row():
+        with gr.Column(scale=0, min_width=220):
+            lang_radio = gr.Dropdown(
+                choices=["English", "Tiếng Việt", "中文", "Español", "Français", "日本語"],
+                value="English",
+                label="🌐 Language",
+                container=True,
+            )
+
     # Connection status bar — auto-populated on load, refreshed after each analysis
     status_bar = gr.HTML(value="<div style='height:36px;'></div>")
 
@@ -402,11 +412,6 @@ with gr.Blocks(css=CSS, theme=gr.themes.Base(), title="MediVision — AMD MI300X
                 ),
                 lines=4,
             )
-            lang_radio = gr.Dropdown(
-                choices=["English", "Tiếng Việt", "中文", "Español", "Français", "日本語"],
-                value="English",
-                label="Language / Ngôn ngữ",
-            )
             submit_btn = gr.Button(
                 "🔬  Analyze  /  Phân tích",
                 variant="primary",

src/agent.py

@@ -23,10 +23,14 @@ def _build_prompt(image_path: str | None, text_description: str, lang: str) -> s
         "The user has provided"
         + (" an image of a skin condition and" if has_image else "")
         + f" the following symptom description:\n\n{text_description}\n\n"
-        "Provide a JSON object with these exact keys:\n"
-        "  diagnosis, severity (Low|Medium|High|Urgent), "
-        "recommended_actions (list of strings), confidence_score (integer 0-100).\n"
-        "Be medically thorough but write at a patient-friendly reading level."
+        "Analyze the above and respond with a single JSON object using these exact keys:\n"
+        "  \"diagnosis\": a concise clinical condition name (e.g. 'Contact Dermatitis', "
+        "'Superficial Laceration', 'Cellulitis') — NOT a restatement of the patient's "
+        "symptoms. Use the standard medical term, translated into the response language.\n"
+        "  \"severity\": one of Low | Medium | High | Urgent\n"
+        "  \"recommended_actions\": list of 3-5 actionable strings\n"
+        "  \"confidence_score\": integer 0-100\n"
+        "Return only the JSON object, no extra text."
     )