implement markdown-based hint system and add MarkdownHint component

app/src/main/assets/hints/example_hint.md

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+# How to Scan for AI Models
+
+This guide explains how to use the **Scan** feature to discover and add AI models to your app.
+
+## How Scanning Works
+
+The scan feature searches for available AI models on your device or network.
+
+> **Note:** Results depend on your API key permissions.
+
+### Key Points
+
+- Only public models are shown by default
+- Private models require additional setup
+- Try again if no models are found
+
+## Why Some Models Are Missing
+
+Some models may not appear in the scan results due to:
+
+| Reason | Description | Icon |
+|--------|-------------|------|
+| Restricted access | Model requires special permissions | 🔒 |
+| Not suitable | Model type not supported | ⚠️ |
+| Text only | Only text-based models are supported | ✓ |
+
+### Model Tiers
+
+We recommend these tiers for optimal performance:
+
+- **Nano** - Fastest, for simple tasks
+- **Mini** - Balanced speed and capability
+- **Small** - Good for most tasks
+- **Medium** - More capable, slower
+- **Large** - Most capable, paid only
+
+## Tips for Success
+
+1. **Verify your API key** is active and has correct permissions
+2. **Select the correct organization** from your account
+3. **Type model names manually** if scanning doesn't find them
+4. **Prefer instruct or chat models** for text generation
+
+```kotlin
+// Example: Manual model addition
+val model = Model(
+    name = "llama3.2",
+    type = ModelType.TEXT,
+    provider = "ollama"
+)
+```
+
+## Visual Guide
+
+### Step 1: Initiate Scan
+
+Click the scan button to search for available models.
+
+### Step 2: Select Model Type
+
+Choose between different model categories:
+
+- **Text Chat** - For conversational AI
+- **Instruct** - For direct instructions
+- **Complete** - For text completion
+
+### Step 3: Add & Validate
+
+Add the selected model and validate it works correctly.
+
+---
+
+## Can't Find Your Model?
+
+If your model doesn't appear in the scan results:
+
+1. Check if the model is running locally or accessible via API
+2. Verify network connectivity
+3. Try adding it manually by entering the model details
+
+> **Pro Tip:** You can always add models manually by clicking the "+" button in the models screen.
+
+---
+
+*Last updated: 2024-01-15*
+*For more help, visit our documentation website.*