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.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pysim-simple-server"
-version = "3.6.45"
+version = "3.6.46"
 description = "HTTP REST server wrapping pysim for the SIMple PWA"
 requires-python = ">=3.8"
 # pysim is a git-only dependency installed explicitly by setup.bat/setup.sh.