kaintuck: shared-market connection chip on the splash

#56 in Riparion/riparion-retro — merged 2026-06-15

Narrows the connection UI to exactly what was asked: a compact ● shared market chip on the splash screen (only when wired to a server; nothing in offline play). Removes the all-screens bar and the SharedMarket component. Bumps kaintuck 0.1.26 → 0.1.27.

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