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>

bitchatTests/CommandProcessorTests.swift

@@ -0,0 +1,42 @@
+import XCTest
+@testable import bitchat
+
+final class CommandProcessorTests: XCTestCase {
+
+    @MainActor
+    func test_slap_notFoundGrammar() {
+        let processor = CommandProcessor(chatViewModel: nil, meshService: nil)
+        let result = processor.process("/slap @system")
+        switch result {
+        case .error(let message):
+            XCTAssertEqual(message, "cannot slap system: not found")
+        default:
+            XCTFail("Expected error result")
+        }
+    }
+
+    @MainActor
+    func test_hug_notFoundGrammar() {
+        let processor = CommandProcessor(chatViewModel: nil, meshService: nil)
+        let result = processor.process("/hug @system")
+        switch result {
+        case .error(let message):
+            XCTAssertEqual(message, "cannot hug system: not found")
+        default:
+            XCTFail("Expected error result")
+        }
+    }
+
+    @MainActor
+    func test_slap_usageMessage() {
+        let processor = CommandProcessor(chatViewModel: nil, meshService: nil)
+        let result = processor.process("/slap")
+        switch result {
+        case .error(let message):
+            XCTAssertEqual(message, "usage: /slap <nickname>")
+        default:
+            XCTFail("Expected error result for usage message")
+        }
+    }
+}
+