[eizedev]

Summary

new_device named the port where a switch learned a MAC address, also when that port only leads to a router: a phone joining the router's Wi-Fi was "new on port 1". A switch cannot tell the router port by itself here (no LLDP from the router, no routing table over SNMP on the 1920S).

The event now carries devices_on_port and direct (alone on its port). The blueprint gets Only devices plugged in directly (on by default); with it off, shared ports are reported as "seen via port 1 (with 13 other devices)".

Fixes #19

Also: docs/card.md and its screenshot show the card's new link symbol (⇄, managed-switch-card 0.1.1, eizedev/managed-switch-card#9).

Test plan

• uv run pytest --cov (87 passed, 100 %), uv run mypy, uv run ruff check . pass
• Blueprint condition and message rendered for direct, shared with and without the option, and events from older versions without direct
• Every user-facing text is in strings.json and both translations — no new texts
• No personal data in code, docs or test data
• Breaking changes: none; existing automations from the blueprint get the new option's default (on), so they stop reporting devices on shared ports
• CHANGELOG.md, docs/events.md updated

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