UI: SCP80 top-level tab hosting Secured packet + Cards pills; v1.9.9

Secured Packet and Cards pages move into a new SCP80 top-level tab
(positioned next to C-APDU), switched by rounded-full pills - both
features are SCP80 concerns and more SCP80 operations are planned.

- nav: 'sp'/'cards' buttons replaced by single data-tab=scp80 button
- new #tab-scp80 with scp80-subtab pills and re-parented page wrappers
  (#scp80-sub-sp / #scp80-sub-cards); all element IDs preserved so
  genSp/verify/send-to-card/CNTR-sync/preset flows are untouched
- switchTab(): sp/cards branches replaced by scp80 -> help anchor
- new scp80SwitchSubtab(): pill styling, wrapper visibility, per-pill
  help anchor (secured-packet | cards)
- packToSp() hands off via switchTab('scp80') + Secured packet pill

Version 1.9.8 -> 1.9.9 everywhere; SW cache otaman-v19 -> otaman-v20

docs/api.md

@@ -54,7 +54,7 @@ Returns server version for compatibility checking.
 
 **Example response:**
 ```json
-{"version": "1.9.8"}
+{"version": "1.9.9"}
 ```
 
 ### `GET /api/status`