Auto-navigate SpoolBuddy to dashboard on tag scan

  When an NFC tag is detected while the UI is on a non-dashboard page
  (Settings, AMS, Write Tag, Calibration), automatically navigate back
  to the main dashboard to display the scanned spool. Also wakes the
  screen if the display blank timeout had kicked in.

CHANGELOG.md

@@ -19,10 +19,11 @@ All notable changes to Bambuddy will be documented in this file.
 - **SpoolBuddy Install Script Now Upgrades System Packages** — The install script now runs `apt-get upgrade -y` after installing required packages and the WiFi safeguard. This ensures the Pi is fully up to date before SpoolBuddy is deployed, and the WiFi safeguard protects connectivity during the upgrade.
 - **SpoolBuddy Assign-to-AMS Material Mismatch Warnings** — The SpoolBuddy "Assign to AMS" modal now warns when the spool's material or slicer profile doesn't match the target slot's current filament. Shows a confirmation dialog with five warning levels: exact material mismatch, partial material match, profile-only mismatch, and combined material+profile mismatches. Respects the global `disable_filament_warnings` setting. Previously, assigning a spool to an occupied slot proceeded without any validation, matching the behavior already present in the main Assign Spool modal.
 - **Spool Assignment Changes Sync Across Tabs** — Assigning or unassigning a spool now broadcasts a WebSocket event to all connected clients. Other open browser tabs and the SpoolBuddy frontend update automatically without requiring a page reload.
+- **SpoolBuddy Auto-Navigate on Tag Scan** — When an NFC tag is detected while the SpoolBuddy UI is on a non-dashboard page (Settings, AMS, Write Tag, etc.), the frontend automatically navigates back to the main dashboard to show the scanned spool. Also wakes the screen if the display was blanked.
 - **SpoolBuddy System Tab** — Added a "System" tab to SpoolBuddy Settings showing live OS stats from the Raspberry Pi: CPU temperature, core count, load average, memory usage, disk usage, OS distro/kernel/architecture, Python version, and system uptime. Stats are collected by the daemon every heartbeat (10s) using stdlib-only reads from `/proc` and `/sys` — no additional dependencies required. Usage bars turn amber at 70% and red at 90%; CPU temperature is color-coded green/amber/red.
 
 ### Fixed
-- **SpoolBuddy Read Tag Diagnostic Fails on NTAG Tags** — The `read_tag.py` diagnostic script had four issues preventing NTAG reads: (1) SAK `0x04` (MIFARE Ultralight family) was rejected as "unsupported tag type" — now accepts both `0x00` and `0x04`. (2) `ntag_read_pages` had TX CRC off (should be on per NTAG spec), no Crypto1 clear, and no IDLE→TRANSCEIVE state reset. (3) The PN5180 needs a full IDLE→TRANSCEIVE state machine reset between each 4-page READ batch — added between-batch resets so multi-batch reads (pages 4-20) succeed. (4) `ntag_write_page`/`ntag_write_pages` had the same stale CRC/state issues plus unreliable ACK checking and post-write verification — synced with daemon.
+- **SpoolBuddy Read Tag Diagnostic Fails on NTAG Tags** — The `read_tag.py` diagnostic script had five issues preventing NTAG reads: (1) SAK `0x04` (MIFARE Ultralight family) was rejected as "unsupported tag type" — now accepts both `0x00` and `0x04`. (2) `ntag_read_pages` had TX CRC off (should be on per NTAG spec), no Crypto1 clear, and no IDLE→TRANSCEIVE state reset. (3) The PN5180 enters an unrecoverable state after an NTAG READ command — added full GPIO hardware reset between each 4-page batch. (4) Reading past the end of smaller tags (MIFARE Ultralight has 16 pages vs NTAG's 44+) caused a hard failure — now returns partial data gracefully. (5) `ntag_write_page`/`ntag_write_pages` had the same stale CRC/state issues plus unreliable ACK checking and post-write verification — synced with daemon.
 - **Delete Tag Leaves Stale Tag Type** — The "Delete Tag" button in the spool edit modal only cleared `tag_uid` but left `tray_uuid`, `tag_type`, and `data_origin` intact. All tag-related fields are now cleared together.
 - **SpoolBuddy NFC Write Fails on NTAG Tags** — Multiple issues prevented writing to NTAG 213/215/216 tags. (1) Some chips report SAK `0x04` (MIFARE Ultralight family) instead of `0x00` during anticollision — both `0x00` and `0x04` are now accepted. (2) TX CRC was disabled for NTAG commands but the spec requires it — enabled for both WRITE and READ. (3) The PN5180 state machine needed IDLE→TRANSCEIVE resets (not just `set_transceive_mode()`) and Crypto1 cleared before NTAG operations. (4) The 4-bit WRITE ACK cannot be captured by the PN5180 (SOF detected but no RX_IRQ) — removed per-page ACK checking. (5) Post-write read-back verification also failed (second READ command gets no response from the PN5180) — removed verification since the tag reliably ACKs each write.
 - **Database Connection Pool Exhaustion on Large Printer Farms** — Users with 100+ printers connected simultaneously experienced `QueuePool limit of size 10 overflow 20 reached, connection timed out` errors. Increased the SQLAlchemy connection pool from 30 total (10 base + 20 overflow) to 220 (20 base + 200 overflow), and raised the SQLite busy_timeout from 5 to 15 seconds to reduce write contention under heavy concurrent MQTT updates.

frontend/src/components/spoolbuddy/SpoolBuddyLayout.tsx

@@ -1,5 +1,5 @@
 import { useState, useEffect, useRef, useCallback, useMemo } from 'react';
-import { Outlet } from 'react-router-dom';
+import { Outlet, useNavigate, useLocation } from 'react-router-dom';
 import { useQuery } from '@tanstack/react-query';
 import { useTranslation } from 'react-i18next';
 import { SpoolBuddyTopBar } from './SpoolBuddyTopBar';
@@ -17,6 +17,8 @@ export function SpoolBuddyLayout() {
   const [displayBlankTimeout, setDisplayBlankTimeout] = useState(0);
   const lastActivityRef = useRef(Date.now());
   const { i18n } = useTranslation();
+  const navigate = useNavigate();
+  const location = useLocation();
   const sbState = useSpoolBuddyState();
 
   // Sync language from backend settings (kiosk has its own browser with empty localStorage)
@@ -98,6 +100,17 @@ export function SpoolBuddyLayout() {
     };
   }, [resetActivity]);
 
+  // Auto-navigate to dashboard when a tag is detected on a non-dashboard page
+  const tagDetected = Boolean(sbState.matchedSpool || sbState.unknownTagUid);
+  useEffect(() => {
+    if (tagDetected) {
+      resetActivity();
+      if (location.pathname !== '/spoolbuddy') {
+        navigate('/spoolbuddy');
+      }
+    }
+  }, [tagDetected, location.pathname, navigate, resetActivity]);
+
   // Screen blank timer
   useEffect(() => {
     if (displayBlankTimeout <= 0) return;

static/index.html

@@ -23,7 +23,7 @@
 
     <!-- Splash screens for iOS -->
     <link rel="apple-touch-startup-image" href="/img/android-chrome-512x512.png" />
-    <script type="module" crossorigin src="/assets/index-BIwdarJO.js"></script>
+    <script type="module" crossorigin src="/assets/index-BruWyGaL.js"></script>
     <link rel="stylesheet" crossorigin href="/assets/index-CZLTApPU.css">
   </head>
   <body>