fix: off-state colors, mobile audio route, iOS rail/PTR, in-place join, draggable bars (0.1.16/batch76)

Regressions I introduced, now fixed:
#8d Mic/Camera OFF went DIM — my new `.meet-ic.off` rule overrode the original RED.
    Scoped the lite style to the speaker button only; mic/cam OFF are red again.
#7  Guest "left the meeting" was unstyled (dark text on blue, no card): the card CSS was
    scoped to .guest-prejoin only. Shared with .guest-left. Rejoin no longer dead-ends —
    if the room is gone we say "This meeting has ended" and hide the button.

Reported:
#8d Speaker button no longer shows on desktop (devices already live under the mic ▾).
#8c/#8e Mobile speaker button now CYCLES Speaker → Earpiece → Bluetooth (icon follows the
    route); dropped the redundant "Audio devices" entry from the ⋮ menu.
#8a iOS gap under the bottom rail: the page rubber-band-bounced, exposing background beneath
    the fixed bar. overscroll-behavior:none + fixed body pins it.
#8b Pull-to-refresh now fires on iOS too (overscroll-behavior:contain on the lists so Safari's
    rubber band stops swallowing the gesture; scrollTop>2 tolerance for momentum).
#5  A meeting link no longer opens a whole new window: same-origin urls navigate the main
    window in the shell, and a link clicked in chat joins the meeting IN PLACE.

New observations:
1. The viewer's mic now starts MUTED on a screen session (and can actually be un/muted).
2. iOS lightbox close/download buttons moved below the Dynamic Island (safe-area insets).
3. Meeting chat: recipient picker moved to the BOTTOM next to the input; a private message
   auto-targets your reply back to that person; private vs everyone are visibly different
   (brand amber vs blue/neutral) and the compose area tints in private mode.
4. Meeting bar + screen-session bars are DRAGGABLE (position remembered) so they stop
   covering the shared screen.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

desktop/package.json

@@ -1,6 +1,6 @@
 {
   "name": "biz-connect-desktop",
-  "version": "0.1.15",
+  "version": "0.1.16",
   "description": "Biz Connect technician desktop client — loads the Connect web UI with native screen capture",
   "author": {
     "name": "BizGaze",