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/Views/ContentView.swift

@@ -444,7 +444,19 @@ struct ContentView: View {
                 let id = url.path.trimmingCharacters(in: CharacterSet(charactersIn: "/"))
                 let peerID = id.removingPercentEncoding ?? id
                 selectedMessageSenderID = peerID
-                selectedMessageSender = viewModel.messages.last(where: { $0.senderPeerID == peerID })?.sender
+                // Derive a stable display name from the peerID instead of peeking at the last message,
+                // which may be a transformed system action (sender == "system").
+                if peerID.hasPrefix("nostr") {
+                    // For geohash senders, resolve display name via mapping (works for "nostr:" and "nostr_" keys)
+                    selectedMessageSender = viewModel.geohashDisplayName(for: peerID)
+                } else {
+                    // Mesh sender: use current mesh nickname if available; otherwise fall back to last non-system message
+                    if let name = viewModel.meshService.peerNickname(peerID: peerID) {
+                        selectedMessageSender = name
+                    } else {
+                        selectedMessageSender = viewModel.messages.last(where: { $0.senderPeerID == peerID && $0.sender != "system" })?.sender
+                    }
+                }
                 showMessageActions = true
             }
             .onOpenURL { url in