Polish SpoolBuddy boot splash image

  New splash shows only the SpoolBuddy logo with baked-in green glow,
  radial gradient background, subtle light rays, and vignette effects
  (66KB vs 205KB). Removed Bambuddy branding. Includes generator
  script for easy customization.

CHANGELOG.md

@@ -25,7 +25,7 @@ All notable changes to Bambuddy will be documented in this file.
 - **Removed Diagnostic Buttons from Write Tag Page** — Removed the "NFC Diag" and "Scale Diag" buttons from the NFC status panel on the Write Tag page. These diagnostics are accessible from the Settings page and don't belong on the tag writing flow.
 - **SpoolBuddy Assign Spool Modal No Longer Clips Display** — The shared Assign Spool modal overflowed off-screen on the small SpoolBuddy touchscreen, hiding the footer buttons. Added scoped CSS in the SpoolBuddy AMS page that caps the modal at 90vh with a scrollable spool list, without affecting the main Bambuddy frontend.
 - **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.
-- **SpoolBuddy Boot Splash Overhaul** — Replaced Plymouth with fim for a lighter, faster boot splash. Plymouth ran as a persistent daemon throughout boot, consuming memory and competing for framebuffer allocation. fim renders via DRM, displays the image, and exits — zero ongoing resource cost. The new splash displays only the SpoolBuddy logo with polished glow effects, radial gradient background, light rays, and vignette (66KB vs 205KB). Plymouth is automatically removed on upgrade via a single `apt purge` (avoids redundant initramfs rebuilds). A generator script (`generate_splash.py`) is included for easy customization.
+- **SpoolBuddy Boot Splash Polished** — New splash image displays only the SpoolBuddy logo (removed Bambuddy branding) with polished glow effects, radial gradient background, subtle light rays, and vignette (66KB vs 205KB). A generator script (`generate_splash.py`) is included for easy customization.
 
 ### Fixed
 - **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.