Add TUI documentation for F6-F8 screens and regenerate screenshots

Update tui.mdx with Device, Stream, and Config screen sections
including keyboard shortcuts, Tabs/Steps components, and safety
warnings. Update generate_screenshots.py to capture all 11 screens.
Regenerate all SVGs with current sidebar layout.

site/src/content/docs/tools/tui.mdx

@@ -1,11 +1,11 @@
 ---
 title: SkyWalker TUI
-description: Interactive terminal dashboard for spectrum analysis, transponder scanning, signal monitoring, L-band analysis, and carrier tracking.
+description: Interactive terminal dashboard for spectrum analysis, transponder scanning, signal monitoring, L-band analysis, carrier tracking, device management, transport stream analysis, and hardware configuration.
 ---
 
 import { Tabs, TabItem, Steps, Aside, Badge } from '@astrojs/starlight/components';
 
-The SkyWalker TUI is a full-screen terminal dashboard built on [Textual](https://textual.textualize.io/) that wraps all five RF operating modes into a single interactive interface. Sidebar navigation, F-key shortcuts, real-time widget updates, and a dark/light theme toggle replace the separate CLI subcommands with a unified experience.
+The SkyWalker TUI is a full-screen terminal dashboard built on [Textual](https://textual.textualize.io/) that wraps all eight operating modes into a single interactive interface. Five RF signal modes (Spectrum, Scan, Monitor, L-Band, Track) plus Device management, Transport Stream analysis, and hardware Config — all with sidebar navigation, F-key shortcuts, real-time widget updates, and a dark/light theme toggle.
 
 <Badge text="Requires custom firmware v3.02.0+" variant="caution" />
 
@@ -34,7 +34,7 @@ uv run skywalker-tui --demo
 | `--demo` | Synthetic signal data — no SkyWalker-1 USB device needed |
 | `--no-splash` | Skip the startup splash screen |
 | `--verbose, -v` | Verbose USB logging (hardware mode only) |
-| `MODE` | Initial mode: `spectrum` (default), `scan`, `monitor`, `lband`, `track` |
+| `MODE` | Initial mode: `spectrum` (default), `scan`, `monitor`, `lband`, `track`, `device`, `stream`, `config` |
 
 <Aside type="tip">
 Demo mode generates realistic-looking synthetic data for every screen, making it useful for familiarization, documentation, and development without satellite hardware.
@@ -51,6 +51,9 @@ Demo mode generates realistic-looking synthetic data for every screen, making it
 | <kbd>F3</kbd> | Signal monitor |
 | <kbd>F4</kbd> | L-Band analyzer |
 | <kbd>F5</kbd> | Carrier tracker |
+| <kbd>F6</kbd> | Device management |
+| <kbd>F7</kbd> | Transport stream |
+| <kbd>F8</kbd> | Hardware config |
 | <kbd>d</kbd> | Toggle dark/light theme |
 | <kbd>q</kbd> | Quit |
 | <kbd>Ctrl+W</kbd> | Easter egg |
@@ -127,6 +130,84 @@ Carrier/beacon tracker with timestamped logging. Tracks a single frequency and d
 - Event log with timestamped lock/unlock transitions
 - Frequency drift detection
 
+### Device <Badge text="F6" variant="note" />
+
+Firmware management, EEPROM operations, and hardware diagnostics. An identity panel at the top always shows firmware version, serial number, USB speed, and config register flags.
+
+![Device management](../../../assets/tui/device.svg)
+
+<Tabs>
+  <TabItem label="Firmware">
+    - FX2 RAM read at arbitrary addresses rendered as scrollable hex dump
+    - CPU Halt / Start controls for the Cypress FX2 microcontroller
+    - Non-destructive — RAM contents revert on power cycle
+  </TabItem>
+  <TabItem label="EEPROM">
+    - Read full 16 KB EEPROM with progress bar
+    - One-click backup to timestamped `.bin` file
+    - Flash with full safety state machine:
+
+    <Steps>
+    1. **C2 validation** — magic byte, VID/PID match, END marker, record parsing
+    2. **Auto-backup** — saves current EEPROM to timestamped file before any write
+    3. **3-second countdown** — ABORT button auto-focused (accidental keypress = cancel)
+    4. **Page write** — 16-byte pages with progress bar and circuit breaker (3 consecutive errors = abort)
+    5. **Byte-verify** — full readback with diff highlighting in hex view
+    </Steps>
+  </TabItem>
+  <TabItem label="Diagnostics">
+    - Boot test with mode selector (0x80–0x85) showing stage progression
+    - I2C bus scan identifying BCM4500, EEPROM, tuner, and LNB controller
+    - BCM4500 register dump rendered as hex view
+  </TabItem>
+</Tabs>
+
+<Aside type="danger">
+EEPROM flash is the only operation that can brick the device. The safety state machine prevents accidental writes, but a power loss during write will corrupt the boot image. The verify step detects partial writes — if it fails, **do not power cycle** until the flash is retried successfully.
+</Aside>
+
+### Stream <Badge text="F7" variant="note" />
+
+Live MPEG-2 Transport Stream capture and analysis. Reads raw 188-byte TS packets from the SkyWalker-1 bulk endpoint, parses them in real time, and displays PID distribution statistics alongside a hierarchical PSI program structure tree.
+
+![Stream analysis](../../../assets/tui/stream.svg)
+
+- PID distribution table with count, percentage, CC errors, and known PID names
+- PAT/PMT tree display showing transport stream ID, program numbers, PMT PIDs, and elementary stream types (video, audio, data)
+- Aggregate stats: total packets, bytes, unique PIDs, CC errors, duration
+- Capture-to-file mode for saving raw `.ts` files to disk
+- Auto-starts monitoring in demo mode
+
+<Aside type="tip">
+The stream monitor batches UI updates at 500ms intervals to keep the interface responsive even at high packet rates. The USB bulk endpoint is always safely disarmed when monitoring stops.
+</Aside>
+
+### Config <Badge text="F8" variant="note" />
+
+LNB power control, DiSEqC switching, and modulation/FEC configuration — all the hardware settings in one place.
+
+![Hardware configuration](../../../assets/tui/config.svg)
+
+<Tabs>
+  <TabItem label="LNB Control">
+    - Power On / Off toggle
+    - Voltage selection: 13V (vertical) / 18V (horizontal), with optional +1V boost
+    - 22 kHz tone toggle for high-band LNB switching
+    - Current draw warning (450 mA continuous max)
+  </TabItem>
+  <TabItem label="DiSEqC Switch">
+    - Port selector (1–4) sending committed commands
+    - Tone burst A/B for legacy switches
+    - Raw hex message input (3–6 byte DiSEqC 1.0/1.2 commands) with validation
+  </TabItem>
+  <TabItem label="Modulation / FEC">
+    - Modulation type dropdown: QPSK, Turbo QPSK, Turbo 8PSK, DCII Combo, DCII Split I/Q, DCII Offset QPSK, DSS
+    - FEC rate dropdown filtered per modulation group
+    - Symbol rate (256 Ksps – 30 Msps) and frequency inputs
+    - Tune button applies settings to the BCM4500 demodulator
+  </TabItem>
+</Tabs>
+
 ---
 
 ## Easter Eggs
@@ -171,8 +252,10 @@ Use `--no-splash` to skip it.
 
 ## See Also
 
-- [SkyWalker RF Tool](/tools/skywalker/) — CLI version of the same 5 modes (text-only output, scriptable)
+- [SkyWalker RF Tool](/tools/skywalker/) — CLI version of the RF modes (text-only output, scriptable)
 - [Spectrum Analysis](/tools/spectrum-analysis/) — practical how-to guides for each operating mode
 - [Signal Monitoring](/bcm4500/signal-monitoring/) — SIGNAL_MONITOR register protocol and data format
 - [Tuning Tool](/tools/tuning/) — primary tuning, LNB control, and transport stream capture
+- [EEPROM Utilities](/tools/eeprom-utilities/) — standalone CLI for firmware updates (same safety protocol as F6 Device screen)
+- [TS Stream Analyzer](/tools/ts-analyzer/) — standalone TS packet analyzer (same engine as F7 Stream screen)
 - [RF Coverage](/hardware/rf-coverage/) — frequency coverage and antenna considerations