Offer the signer back where you'd notice it's missing

A remote signer dropped by a reload now says so above the composer, with
a button that reconnects in place — rather than letting someone write a
message and only then be told it can't be sent as them. Failing that it
opens the nostr settings, where logging in again is the fallback.

Every remote-signer login made before sessions were persisted lands in
exactly this state once.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Wvj4aoeMZwA7VUGdJP9Swi

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