Fix/general queue (#580)

* Fix emote targeting and grammar; add tests

Prevent 'system' mis-target via peerID-derived display name in actions sheet. Correct /hug and /slap usage/error grammar by passing base command name. Improve geohash nickname resolution to match displayName with #suffix. Add CommandProcessor tests.

* Geohash ordering: strict in-order inserts and timestamp clamp

Use channel-aware late-insert threshold with 0s for geohash to keep strict chronological order. Clamp future Nostr event timestamps to 'now' to avoid future-dated items skewing order in geohash timelines.

* Trim trailing/leading spaces in geohash nicknames and tag emission

Sanitize Nostr 'n' tag values on ingest and emit by trimming whitespace/newlines to prevent trailing spaces in displayed usernames. Local nickname is already trimmed on focus loss and submit.

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Co-authored-by: jack <jackjackbits@users.noreply.github.com>

bitchat/Nostr/NostrProtocol.swift

@@ -107,7 +107,7 @@ struct NostrProtocol {
         teleported: Bool = false
     ) throws -> NostrEvent {
         var tags = [["g", geohash]]
-        if let nickname = nickname, !nickname.isEmpty {
+        if let nickname = nickname?.trimmingCharacters(in: .whitespacesAndNewlines), !nickname.isEmpty {
             tags.append(["n", nickname])
         }
         if teleported {