Auto-threading, history pagination, streaming toggle + tool/reasoning display settings

- Auto-threading (Telegram topic-mode workflow): message.send {auto_thread}
  mints a fresh AI-named thread (instant derived title, LLM upgrade via
  channel.renamed); channel.created {auto:true}; the app jumps into the new
  thread and relocates the optimistic pending bubble.
- history frame: paged full message history for initial channel open /
  scroll-up pagination (reconstructed from the outbox log).
- Streaming on/off: gateway side (display.platforms.android.streaming) plus a
  per-device app toggle (Settings → Streaming); reasoning/model/tokens carried
  on message frames.
- Context menu: long-press (touch) / right-click (desktop) thread affordances
  via a KMP rightClick expect/actual.
- Settings → Reasoning: auto-collapse long reasoning blocks (default on).
- Tool detail: the gateway now always supplies full tool data — it forces
  verbose tool progress (full args → tool.start.args) and captures each
  completed call via the post_tool_call hook (output/duration/ok → tool.end).
  The app reveals the full call + output on expand (Truncated) and
  auto-expands cards in Everything mode.

app/shared/src/commonMain/kotlin/iris/IrisApp.kt

@@ -15,10 +15,8 @@ import iris.platform.setActiveController
 import iris.state.IrisController
 import iris.ui.screens.ChatScreen
 import iris.ui.screens.ConnectScreen
-import iris.ui.screens.ConnectingScreen
 import iris.ui.theme.IrisColors
 import iris.ui.theme.IrisTheme
-import iris.util.hostFromUrl
 
 /**
  * Root composable shared by the Android and Desktop shells.
@@ -63,9 +61,9 @@ fun IrisApp(
                         prefillToken = store.token,
                         initialError = "Pairing rejected: ${s.message}",
                     )
-                // M7: initial connect in flight — dedicated screen, not an empty chat.
-                GatewayClient.State.Connecting ->
-                    ConnectingScreen(hostFromUrl(store.serverUrl))
+                // Connecting / Reconnecting / Connected all render the chat; the header
+                // StatusChip + connection banner show the link state without
+                // blocking the view (M7's full-screen spinner is gone).
                 else -> ChatScreen(controller)
             }
         }