[alcounit]

Show session type on browser cards and make VNC configurable

Annotation	Values	Effect
selenosis.io/session.type	selenium, playwright, devtools, mcp	Card label (unknown otherwise); only selenium browsers appear in the create-browser menus
selenosis.io/session.vnc	"true" enables; anything else or absent disables	Disabled CONNECT and a viewer message when VNC is not available

• Session type label on every card, clickable as a filter.
• Create-browser menus (Dashboard dropdown, Start Browser page) list only selenium browsers; new empty state No Selenium browsers configured.
• session.vnc is resolved per browser version from BrowserConfig (per-version over template; an explicit "false" in any config wins), overridden by the Browser CR annotation set through selenosis options. Config changes re-resolve running sessions.
• GET /api/v1/browsers/{id}/vnc without upgrade is a VNC probe (204 / 503); the viewer checks it before the password prompt.
• Session JSON carries vnc; unlabelled configs are grouped as unknown in supportedBrowsers.
• Frontend tests run with NODE_OPTIONS=--no-experimental-webstorage so jsdom's localStorage works on Node 25+.

Breaking: VNC is off unless selenosis.io/session.vnc: "true"; Selenium configs need selenosis.io/session.type: selenium to stay in the create menu.

Implements alcounit/selenosis#84