fix: all tabs inside the page container + compact RAM row (v3.6.46)

The max-w-7xl mx-auto page container closed before #tab-scp81, so SCP81
and Cards rendered directly under <body> and stretched to the whole window
while the other five tabs were capped at 1280 px.  The closing </div> moved
after #tab-cards (before the modals); a structural test walks the markup
and asserts every tab-content has the container as an ancestor (verified to
fail on the old nesting with 'tab-scp81 must be inside the max-w-7xl page
container').

The SCP80/RAM form's Card preset and Operation selects now share one
flex gap-2 items-end row with Execute (guarded by a markup test).

sw cache simple-v319; tests: 531 Python / 683 Node.

pysim_simple_server/server.py

@@ -31,7 +31,7 @@ from osmocom.tlv import BER_TLV_IE
 from osmocom.utils import rpad
 
 
-VERSION = '3.6.45'
+VERSION = '3.6.46'
 
 MAX_ENVELOPE_SEGMENTS = 5  # max SMS segments for outgoing C-APDU in ENVELOPE