chore(branding): point firmware at wevisto.com

Flip APP_BASE_URL and the on-screen "go to <domain>/setup/..." text in
the rendered setup_bg images from pictureframe.edholm.me to wevisto.com.
Per the dual-domain migration plan (Option C — server keeps both alive
indefinitely), this only affects newly-flashed units; field devices on
the old URL keep working against the same backend.

Regenerated both panels' setup_bg.bin via gen_screens*.py so the
embedded URL in the on-screen QR overlay text matches the firmware's
runtime poll URL.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/gen_screens.py

@@ -18,7 +18,7 @@ import os, sys
 
 # URL for the user manual QR baked into Step 1/2. Static on purpose —
 # changing it requires regenerating the bg images + uploadfs.
-MANUAL_URL = "https://pictureframe.edholm.me/help"
+MANUAL_URL = "https://wevisto.com/help"
 
 # ── Display ──────────────────────────────────────────────────────────────────
 W, H = 800, 480
@@ -386,7 +386,7 @@ def gen_setup():
     url_y = BODY_Y + 278
     draw.rectangle([28, url_y, 284, url_y+32], fill=BK)
     draw.text((38, url_y+4),  "URL", font=F_TINY, fill=GR)
-    draw.text((38, url_y+16), "pictureframe.edholm.me/setup/...", font=ttf("DejaVuSans.ttf", 10), fill=WH)
+    draw.text((38, url_y+16), "wevisto.com/setup/...", font=ttf("DejaVuSans.ttf", 10), fill=WH)
 
     # Progress track
     prog_y = BODY_Y + 328