Add rtl_433 sensor decoding and UI improvements

Features:
- Add 433MHz sensor decoding via rtl_433 integration
- Add mode tabs to switch between Pager and 433MHz modes
- Add sensor data display with device model, readings
- Add separate stats for sensors (readings count, unique devices)
- Add favicon
- Add audio alerts, export (CSV/JSON), signal meter, waterfall display
- Add auto-restart on frequency change
- Add relative timestamps

UI:
- Add author credit (smittix) to header
- Fix tool status alignment with grid layout
- Update stats display to switch with mode tabs

Docs:
- Update README with rtl_433 installation and usage
- Add "What is INTERCEPT?" section explaining front-end purpose
- Add author section and badge
- Update LICENSE copyright

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -4,6 +4,7 @@
   <img src="https://img.shields.io/badge/python-3.7+-blue.svg" alt="Python 3.7+">
   <img src="https://img.shields.io/badge/license-MIT-green.svg" alt="MIT License">
   <img src="https://img.shields.io/badge/platform-macOS%20%7C%20Linux-lightgrey.svg" alt="Platform">
+  <img src="https://img.shields.io/badge/author-smittix-cyan.svg" alt="Author">
 </p>
 
 <p align="center">
@@ -11,8 +12,8 @@
 </p>
 
 <p align="center">
-  A sleek, modern web-based pager decoder using RTL-SDR and multimon-ng.<br>
-  Decode POCSAG and FLEX pager signals with a futuristic SpaceX-inspired interface.
+  A sleek, modern web-based front-end for RTL-SDR signal decoding tools.<br>
+  Provides a unified interface for multimon-ng (POCSAG/FLEX) and rtl_433 (433MHz sensors).
 </p>
 
 ## Screenshot
@@ -20,15 +21,40 @@
 
 ---
 
+## What is INTERCEPT?
+
+INTERCEPT is a **web-based front-end** that provides a unified, modern interface for popular RTL-SDR signal decoding tools:
+
+- **rtl_fm + multimon-ng** - For decoding POCSAG and FLEX pager signals
+- **rtl_433** - For decoding 433MHz ISM band devices (weather stations, sensors, etc.)
+
+Instead of running command-line tools manually, INTERCEPT handles the process management, output parsing, and presents decoded data in a clean, real-time web interface.
+
+---
+
 ## Features
 
+### Pager Decoding
 - **Real-time decoding** of POCSAG (512/1200/2400) and FLEX protocols
+- **Customizable frequency presets** stored in browser
+- **Auto-restart** on frequency change while decoding
+
+### 433MHz Sensor Decoding
+- **200+ device protocols** supported via rtl_433
+- **Weather stations** - temperature, humidity, wind, rain
+- **TPMS** - Tire pressure monitoring sensors
+- **Doorbells, remotes, and IoT devices**
+- **Smart meters** and utility monitors
+
+### General
 - **Web-based interface** - no desktop app needed
 - **Live message streaming** via Server-Sent Events (SSE)
+- **Audio alerts** with mute toggle
+- **Message export** to CSV/JSON
+- **Signal activity meter** and waterfall display
 - **Message logging** to file with timestamps
-- **Customizable frequency presets** stored in browser
 - **RTL-SDR device detection** and selection
-- **Configurable gain, squelch, and PPM correction**
+- **Configurable gain and PPM correction**
 
 
 ## Requirements
@@ -40,7 +66,8 @@
 - Python 3.7+
 - Flask
 - rtl-sdr tools (`rtl_fm`)
-- multimon-ng
+- multimon-ng (for pager decoding)
+- rtl_433 (for 433MHz sensor decoding)
 
 ## Installation
 
@@ -75,7 +102,7 @@ sudo apt-get install multimon-ng
 
 **From source:**
 ```bash
-git clone https://github.com/EliasOewortal/multimon-ng.git
+git clone https://github.com/EliasOenal/multimon-ng.git
 cd multimon-ng
 mkdir build && cd build
 cmake ..
@@ -83,13 +110,35 @@ make
 sudo make install
 ```
 
-### 3. Install Python dependencies
+### 3. Install rtl_433 (optional, for 433MHz sensors)
+
+**macOS (Homebrew):**
+```bash
+brew install rtl_433
+```
+
+**Ubuntu/Debian:**
+```bash
+sudo apt-get install rtl-433
+```
+
+**From source:**
+```bash
+git clone https://github.com/merbanan/rtl_433.git
+cd rtl_433
+mkdir build && cd build
+cmake ..
+make
+sudo make install
+```
+
+### 4. Install Python dependencies
 
 ```bash
 pip install -r requirements.txt
 ```
 
-### 4. Clone and run
+### 5. Clone and run
 
 ```bash
 git clone https://github.com/yourusername/intercept.git
@@ -119,12 +168,19 @@ Open your browser to `http://localhost:5050`
 
 Enable logging in the Logging section to save decoded messages to a file. Messages are saved with timestamp, protocol, address, and content.
 
-## Default Frequencies (UK)
+## Default Frequencies
 
+### Pager (UK)
 - **153.350 MHz** - UK pager frequency
 - **153.025 MHz** - UK pager frequency
 
-You can customize these presets in the web interface.
+### 433MHz Sensors
+- **433.92 MHz** - EU/UK ISM band (most common)
+- **315.00 MHz** - US ISM band
+- **868.00 MHz** - EU ISM band
+- **915.00 MHz** - US ISM band
+
+You can customize pager presets in the web interface.
 
 ## API Endpoints
 
@@ -132,10 +188,13 @@ You can customize these presets in the web interface.
 |----------|--------|-------------|
 | `/` | GET | Main web interface |
 | `/devices` | GET | List RTL-SDR devices |
-| `/start` | POST | Start decoding |
-| `/stop` | POST | Stop decoding |
+| `/start` | POST | Start pager decoding |
+| `/stop` | POST | Stop pager decoding |
+| `/start_sensor` | POST | Start 433MHz sensor listening |
+| `/stop_sensor` | POST | Stop 433MHz sensor listening |
 | `/status` | GET | Get decoder status |
-| `/stream` | GET | SSE stream for messages |
+| `/stream` | GET | SSE stream for pager messages |
+| `/stream_sensor` | GET | SSE stream for sensor data |
 | `/logging` | POST | Toggle message logging |
 | `/killall` | POST | Kill all decoder processes |
 
@@ -160,10 +219,15 @@ You can customize these presets in the web interface.
 
 MIT License - see [LICENSE](LICENSE) for details.
 
+## Author
+
+Created by **smittix** - [GitHub](https://github.com/smittix)
+
 ## Acknowledgments
 
 - [rtl-sdr](https://osmocom.org/projects/rtl-sdr/wiki) - RTL-SDR drivers
-- [multimon-ng](https://github.com/EliasOenal/multimon-ng) - Multi-protocol decoder
+- [multimon-ng](https://github.com/EliasOenal/multimon-ng) - Multi-protocol pager decoder
+- [rtl_433](https://github.com/merbanan/rtl_433) - 433MHz sensor decoder
 - Inspired by the SpaceX mission control aesthetic
 
 ## Disclaimer