refactor: stop pinning hardcoded main session in chat UI

CHANGELOG.md

@@ -58,6 +58,7 @@
 - Cron: parse Telegram topic targets for isolated delivery. (#478) — thanks @nachoiacovino
 - Cron: enqueue main-session system events under the resolved main session key. (#510)
 - Mobile: centralize main session key normalization for iOS/Android runtime helpers. — thanks @steipete
+- Chat UI: stop pinning hardcoded `main` session in the recent list; prefer active session if missing. — thanks @steipete
 - Outbound: default Telegram account selection for config-only tokens; remove heartbeat-specific accountId handling. (follow-up #516) — thanks @YuriNachos
 - Cron: allow Telegram delivery targets with topic/thread IDs (e.g. `-100…:topic:123`). (#474) — thanks @mitschabaude-bot
 - Heartbeat: resolve Telegram account IDs from config-only tokens; cron tool accepts canonical `jobId` and legacy `id` for job actions. (#516) — thanks @YuriNachos

apps/shared/ClawdbotKit/Sources/ClawdbotChatUI/ChatViewModel.swift

@@ -112,24 +112,19 @@ public final class ClawdbotChatViewModel {
             recent.append(entry)
         }
 
-        let mainKey = "main"
         var result: [ClawdbotChatSessionEntry] = []
         var included = Set<String>()
-        if let main = sorted.first(where: { $0.key == mainKey }) {
-            result.append(main)
-            included.insert(mainKey)
-        } else if self.sessionKey == mainKey {
-            result.append(self.placeholderSession(key: mainKey))
-            included.insert(mainKey)
-        }
-
         for entry in recent where !included.contains(entry.key) {
             result.append(entry)
             included.insert(entry.key)
         }
 
         if !included.contains(self.sessionKey) {
-            result.append(self.placeholderSession(key: self.sessionKey))
+            if let current = sorted.first(where: { $0.key == self.sessionKey }) {
+                result.append(current)
+            } else {
+                result.append(self.placeholderSession(key: self.sessionKey))
+            }
         }
 
         return result