Make pairing requests prominent

[enaboapps]

What changed

• move pending pairing approvals into the main status panel
• hide the connected summary and disconnect action while approvals are pending
• restore connected UI after the final approval clears or expires
• add device-specific accessible names for repeated accept and reject actions
• cover visibility transitions, multiple requests, callback routing, and accessibility names

Why

Pairing approvals were easy to miss because they appeared below the connected UI. Pending approvals are time-sensitive and should take visual priority.

Validation

• dotnet restore src/SwitchifyPc.sln
• dotnet build src/SwitchifyPc.sln -c Release --no-restore
• dotnet test src/SwitchifyPc.sln -c Release --no-build (456 passed)

Closes #449