Fix diagrams: Replace Mermaid with ASCII flowcharts

- Replace non-rendering Mermaid diagrams with emoji ASCII art
- Use box-drawing characters and emojis for clear visualization
- All 4 tabs now have properly rendering flowcharts
- Maintains visual clarity while ensuring compatibility

Flowcharts now show:
- Tab 1: Dual-path name extraction + semantic search
- Tab 2: Voice pipeline with language detection
- Tab 3: Contact search with fuzzy matching
- Tab 4: Complete end-to-end voice contact search

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app.py

@@ -259,14 +259,19 @@ def create_demo():
                         gr.Markdown("""
                         ### 🔍 How It Works
 
-                        ```mermaid
-                        graph TD
-                            A[Your Text Query] --> B[Name Extraction<br/>GLiNER Model]
-                            A --> C[Semantic Search<br/>MiniLM Embeddings]
-                            B --> D[Extract Person Names]
-                            C --> E[Find Matching Divisions]
-                            D --> F[Show Results]
-                            E --> F
+                        ```
+                        📝 Your Text Query
+                              ↓
+                        ┌─────────────┴─────────────┐
+                        ↓                           ↓
+                    👤 GLiNER                  🧠 MiniLM
+                    Extract Names              Embeddings
+                        ↓                           ↓
+                    Person Names              Divisions
+                        ↓                           ↓
+                        └─────────────┬─────────────┘
+                                      ↓
+                              📊 Show Results
                         ```
 
                         **Models Used:**
@@ -307,16 +312,26 @@ def create_demo():
                         gr.Markdown("""
                         ### 🎤 How It Works
 
-                        ```mermaid
-                        graph TD
-                            A[🎙️ Voice Input] --> B[Whisper Base<br/>Speech-to-Text]
-                            B --> C[Auto Language<br/>Detection]
-                            C --> D{English?}
-                            D -->|No| E[Translate to<br/>English]
-                            D -->|Yes| F[Name Extraction<br/>GLiNER]
-                            E --> F
-                            F --> G[Semantic Search<br/>MiniLM]
-                            G --> H[📊 Results]
+                        ```
+                        🎙️ Voice Input
+                              ↓
+                        🎧 Whisper Base
+                        (Speech-to-Text)
+                              ↓
+                        🌍 Auto Language Detection
+                              ↓
+                        ┌─────┴─────┐
+                        ↓           ↓
+                    English?    Other?
+                        ↓           ↓
+                        ↓      🌐 Translate
+                        └─────┬─────┘
+                              ↓
+                        👤 GLiNER Extract Names
+                              ↓
+                        🧠 MiniLM Semantic Search
+                              ↓
+                        📊 Ranked Results
                         ```
 
                         **Models Used:**
@@ -358,16 +373,24 @@ def create_demo():
                         gr.Markdown("""
                         ### 👥 How It Works
 
-                        ```mermaid
-                        graph TD
-                            A[Text Query] --> B[Name Extraction<br/>GLiNER]
-                            A --> C[Division Matching<br/>MiniLM]
-                            B --> D[Extract Names]
-                            C --> E[Find Divisions]
-                            D --> F[Search 500<br/>Contacts]
-                            E --> F
-                            F --> G[Fuzzy Matching<br/>+ Scoring]
-                            G --> H[Ranked Results<br/>by Confidence]
+                        ```
+                        📝 Text Query
+                              ↓
+                        ┌─────────────┴─────────────┐
+                        ↓                           ↓
+                    👤 GLiNER                  🧠 MiniLM
+                    Extract Names              Match Divs
+                        ↓                           ↓
+                    Person Names              Divisions
+                        ↓                           ↓
+                        └─────────────┬─────────────┘
+                                      ↓
+                            🔍 Search 500 Contacts
+                                      ↓
+                            📊 Fuzzy Match + Score
+                                      ↓
+                            ⭐ Ranked Results
+                        (by confidence score)
                         ```
 
                         **Models Used:**
@@ -416,17 +439,29 @@ def create_demo():
                         gr.Markdown("""
                         ### 🎙️ How It Works
 
-                        ```mermaid
-                        graph TD
-                            A[🎤 Voice] --> B[Whisper<br/>Transcribe]
-                            B --> C{Language?}
-                            C -->|Arabic/Other| D[Translate to<br/>English]
-                            C -->|English| E[GLiNER<br/>Extract Names]
-                            D --> E
-                            E --> F[MiniLM<br/>Match Divisions]
-                            F --> G[Search 500<br/>Contacts]
-                            G --> H[Fuzzy Match<br/>+ Score]
-                            H --> I[📋 Ranked<br/>Results]
+                        ```
+                        🎙️ Voice Input
+                              ↓
+                        🎧 Whisper Transcribe
+                              ↓
+                        🌍 Language Detection
+                              ↓
+                        ┌─────┴─────┐
+                        ↓           ↓
+                    English?    Arabic/Other?
+                        ↓           ↓
+                        ↓      🌐 Translate
+                        └─────┬─────┘
+                              ↓
+                        👤 GLiNER Extract Names
+                              ↓
+                        🧠 MiniLM Match Divisions
+                              ↓
+                        🔍 Search 500 Contacts
+                              ↓
+                        📊 Fuzzy Match + Score
+                              ↓
+                        ⭐ Ranked Results
                         ```
 
                         **Full AI Pipeline:**