docs: document expanded reload file watching

Add documentation for PR #3028 which expanded --reload to watch common frontend
file types (JavaScript, TypeScript, CSS, HTML, etc.) in addition to Python files.

- Add 3.0.0beta2 section to v3-features.mdx
- Update CLI Auto-Reload section with reference to file type expansion
- Update running-server.mdx to mention variety of watched file types

Co-authored-by: Jeremiah Lowin <jlowin@users.noreply.github.com>

docs/deployment/running-server.mdx

@@ -169,7 +169,7 @@ During development, you can use the `--reload` flag to automatically restart you
 fastmcp run server.py --reload
 ```
 
-The server watches for changes to Python files in the current directory and restarts automatically when you save changes. This provides a fast feedback loop during development without manually stopping and starting the server.
+The server watches for changes to Python, JavaScript, TypeScript, CSS, HTML, and other common source files in the current directory. It restarts automatically when you save changes, providing a fast feedback loop during development without manually stopping and starting the server.
 
 ```bash
 # Watch specific directories for changes

docs/development/v3-notes/v3-features.mdx

@@ -4,6 +4,14 @@ title: v3.0 Feature Tracking
 
 This document tracks major features in FastMCP v3.0 for release notes preparation.
 
+## 3.0.0beta2
+
+### Expanded Reload File Watching
+
+The `--reload` flag now watches common frontend file types (JavaScript, TypeScript, CSS, HTML, and more) in addition to Python files ([#3028](https://github.com/jlowin/fastmcp/pull/3028)). This enables seamless development for MCP apps that include frontend bundles, automatically restarting the server when any relevant source files change.
+
+---
+
 ## Provider-Based Architecture
 
 v3.0 introduces a provider-based component system that replaces v2's static-only registration ([#2622](https://github.com/jlowin/fastmcp/pull/2622)). Providers dynamically source tools, resources, templates, and prompts at runtime.
@@ -554,7 +562,7 @@ Environment variable: `FASTMCP_DECORATOR_MODE=object`
 
 ## CLI Auto-Reload
 
-The `--reload` flag enables file watching with automatic server restarts for development ([#2816](https://github.com/jlowin/fastmcp/pull/2816)).
+The `--reload` flag enables file watching with automatic server restarts for development ([#2816](https://github.com/jlowin/fastmcp/pull/2816)). The server watches common source file types including Python, JavaScript, TypeScript, CSS, HTML, and configuration files ([#3028](https://github.com/jlowin/fastmcp/pull/3028)).
 
 ```bash
 # Watch for changes and restart
@@ -569,6 +577,7 @@ fastmcp run server.py --reload --transport http --port 8080
 
 Implementation (`src/fastmcp/cli/run.py`):
 - Uses `watchfiles` for efficient file monitoring
+- Watches Python, JavaScript, TypeScript, CSS, HTML, and other common source files
 - Runs server as subprocess for clean restarts
 - Stateless mode for seamless reconnection after restart
 - stdio: Full MCP features including elicitation