fix: count bridged people on the rendezvous cell caption

Summary

Follow-up from the close note on #1611. The rendezvous cell caption under the mesh bridge toggle now adds how many people are across the bridge, and only when that count is at least one. Zero stays the cell line it already was.

The count is a plural substitution (%2$#@people@) in all 30 catalog locales, not one English string reused everywhere.

Test plan

• BridgeSettingsCaption decides no-cell, cell-only, and cell-plus-count. The decision file parses under swiftc.
• With the bridge on and a rendezvous cell, 1 person reads as singular and 2 as plural in a non-English locale.
• With the bridge on and nobody across it, the caption is still just the cell.
• Could not run xcodebuild here (no Xcode). CI covers the catalog and the app build.

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