Add Nebot plugin with chat UI and adaptive typing

Introduces the Nebot plugin, including main process logic for chat session management, IPC handlers, and Ollama API integration. Adds a dedicated chat UI with adaptive typing animation, markdown rendering, settings modal, and supporting assets (CSS, HTML, JS, markdown bundle). Includes documentation for model selection and testing instructions.

plugins/nebot/test-markdown.md

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+# Markdown Test Message
+
+Here's a demonstration of the **rich text formatting** capabilities:
+
+## Text Formatting
+- **Bold text** with double asterisks
+- *Italic text* with single asterisks
+- `Inline code` with backticks
+
+## Code Blocks
+```javascript
+function greetUser(name) {
+  console.log(`Hello, ${name}!`);
+  return `Welcome to Nebot!`;
+}
+```
+
+```python
+def calculate_fibonacci(n):
+    if n <= 1:
+        return n
+    return calculate_fibonacci(n-1) + calculate_fibonacci(n-2)
+```
+
+## Lists and Structure
+
+### Ordered List
+1. First item
+2. Second item 
+3. Third item
+
+### Unordered List
+- Feature A
+- Feature B
+- Feature C
+
+## Blockquotes
+
+> This is a blockquote example.
+> It can span multiple lines and provides
+> emphasis for important information.
+
+## Links and More
+
+Check out [this link](https://github.com) for more information.
+
+---
+
+## Tables
+
+| Feature | Status | Notes |
+|---------|--------|-------|
+| Bold text | ✅ Working | Looks great |
+| Code blocks | ✅ Working | Syntax highlighted |
+| Links | ✅ Working | Open in new tab |
+
+That's it! The markdown rendering should now work beautifully in both the popup panel and the dedicated page.