feat: FS-E strict filesystem mode - ext4 rw driver, FAT32 big-disk fix, forced re-login

- CODE/dsk/ext4.c: minimal full ext4 read/write (GPT probe, feature gate,
  extent depth 0/1 rw, block/inode alloc-free, dir insert, write-verify);
  boot selftest PASS on p2. Unsupported features panic (FS-E2x), zero fallback.
- DSK fat32 write: on-demand FAT entry RMW + chunked free-cluster scan
  (fixes "no free clusters" on 5.3G ESP); rec_len shrink offset (+4) and
  chunk alignment fixes. USER.CONF write-verify ok, firstInit flip ok.
- First-boot: wizard -> persist -> forced login (FS-E06 if skipped/failed)
  -> desktop. login.elf loaded via system/user/use fallback.
- FirstInit network page: Connect now panics NET-E01 (no wlan stack);
  Save (config only) is the only path forward.
- FirstInit/DSK fatal: ohMyLogo lotus fatal screen (NET-E01 / FS-E series).
- Boot screen: Logo.png image removed, "DESHAB P01" text centered only;
  dcp/xj logos regenerated from TEXTURES/.
- run_qemu.bat: main GPT image on SATA ide.0 (AHCI provider must see ext4).

CODE/UTSM/kernel/gen_panic_logo.py

@@ -1,9 +1,9 @@
-#!/usr/bin/env python3
-"""Generate panic_logo_data.inc from ohMyLogo.png (root).
+#!/usr/bin/env python3
+"""Generate RGBA8888 C array from a PNG (panic screen / login intro logo).
 
-- Downscale logo to 384px wide (keep aspect), RGBA8888
-- Sample the 4 corners (averaged) as the panic-screen background color
-Usage: python gen_panic_logo.py <ohMyLogo.png> <panic_logo_data.inc>
+- Downscale logo to target width (keep aspect), RGBA8888
+- Sample the 4 corners (averaged) as background color
+Usage: python gen_panic_logo.py <src.png> <out.c> [target_width]
 """
 import sys
 from PIL import Image
@@ -16,10 +16,11 @@ TARGET_W = 384
 def main() -> None:
     src = sys.argv[1] if len(sys.argv) > 1 else SRC
     dst = sys.argv[2] if len(sys.argv) > 2 else DST
+    target_w = int(sys.argv[3]) if len(sys.argv) > 3 else TARGET_W
     im = Image.open(src).convert("RGBA")
     w0, h0 = im.size
-    scale = TARGET_W / w0
-    w, h = TARGET_W, max(1, round(h0 * scale))
+    scale = target_w / w0
+    w, h = target_w, max(1, round(h0 * scale))
     im = im.resize((w, h), Image.LANCZOS)
     px = im.load()