Tap the Advanced card 10 times and a full-width "Dev mode activated"
strip slides in beneath the two cards — the same 10-tap pattern as the
topbar logo and services-manager unlocks, now at install time. The
choice rides the setup payload (dev_mode) so setup_apply.sh persists
CFG_DEV_MODE=true, and it's mirrored in-process via LpUi.dev so the
next surface already reflects it. 10 more taps toggles it back off.
Counting the Advanced radio's click (not the label's) sidesteps the
label->input double-fire; the radio is pointer-events:none, so each tap
reaches it exactly once. The strip is [hidden] by default (no phantom
gap in the flex column) and replays its entrance keyframes each reveal.
Signed-off-by: librelad <librelad@digitalangels.vip>
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