feat(ui): auto-enter room chat after a successful login

Logging in to a room server (first-time prompt or a remembered password) used
to leave the user on the room list, needing a second Enter to open the chat.
onRoomLoginResult() now opens the room history on success via a shared
openDmHistory() helper (extracted from the Enter-on-contact path).

The login result is async, so the auto-enter is gated on the user still being
on that room in the picker: phase CONTACT_PICK, room mode, no context menu /
share / pick-target sub-flow active, and the result pubkey matching the
selected contact. Otherwise it stays put (no yanking the user into a screen
they navigated away from).

Resolves the "auto-enter after login" code-review item. Builds green:
WioTrackerL1_companion_solo_dual.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/solo_features/message_screen/message_screen.md

@@ -42,9 +42,9 @@ Sensor placeholders appear automatically in the placeholder picker when the corr
 
 ### Rooms — logging in
 
-Posting to a **room server** requires a login handshake first, so the device can log in on its own — no phone app needed. The first time you press **Enter** on a room, a password prompt opens automatically; type the room's password and press the **✓** key (leave it empty and submit for open / no-password rooms).
+Posting to a **room server** requires a login handshake first, so the device can log in on its own — no phone app needed. The first time you press **Enter** on a room, a password prompt opens automatically; type the room's password and press the **✓** key (leave it empty and submit for open / no-password rooms). Once the login succeeds the room's chat **opens automatically** — no second Enter needed (as long as you're still on that room in the list).
 
-- **Passwords are remembered across reboots.** After a successful login the password is saved on the device, so picking that room again — even after a power cycle — logs back in silently without re-prompting.
+- **Passwords are remembered across reboots.** After a successful login the password is saved on the device, so picking that room again — even after a power cycle — logs back in silently and drops you straight into the chat.
 - **A wrong or changed password self-heals.** If a saved password stops working (e.g. the server's password was changed), the failed login forgets it, so the next **Enter** prompts you to type a new one.
 - **Re-login any time** with **Hold Enter** on the room → **Login…** (see the room context menu below) — useful to switch to a new password without waiting for a failure.
 - Passwords set from the **phone app** are saved on the device too, so it can post to that room standalone after a reboot.

examples/companion_radio/ui-new/QuickMsgScreen.h

@@ -621,6 +621,15 @@ public:
     if (success) {
       markRoomLoggedIn(pub_key);
       the_mesh.saveRoomPassword(pub_key, _login_pw);
+      // Auto-enter the room's chat right after a successful login so the user
+      // doesn't have to press Enter a second time. The login result is async,
+      // so only do it if they're still sitting on this same room in the picker
+      // (didn't navigate away, open a menu, or enter a share/pick sub-flow).
+      if (_phase == CONTACT_PICK && _room_mode && !_ctx_menu.active
+          && !_share_mode && !_pick_target
+          && memcmp(_sel_contact.id.pub_key, pub_key, 4) == 0) {
+        openDmHistory();
+      }
     } else {
       // Saved password (if any) no longer works -- forget it so the next
       // ENTER on this room falls back to a manual prompt instead of
@@ -630,6 +639,17 @@ public:
     _task->showAlert(success ? "Login OK" : "Login failed", 1200);
   }
 
+  // Open the message history for the currently selected contact/room and reset
+  // the scroll/selection view state. Shared by the Enter-on-contact path and the
+  // post-login auto-enter.
+  void openDmHistory() {
+    _task->clearDMUnread(_sel_contact.id.pub_key);
+    _dm_hist_sel = -1;
+    _dm_hist_scroll = 0;
+    _dm_fs.active = false;
+    _phase = DM_HIST;
+  }
+
   // Background tick (called every UI loop, regardless of the active screen) that
   // drives auto-resend of on-device DMs — forwarded to the history store.
   void tickDmResends() { _history.tickDmResends(); }
@@ -1351,11 +1371,7 @@ public:
             }
             return true;
           }
-          _task->clearDMUnread(_sel_contact.id.pub_key);
-          _dm_hist_sel = -1;
-          _dm_hist_scroll = 0;
-          _dm_fs.active = false;
-          _phase = DM_HIST;
+          openDmHistory();
           if (_share_mode) beginShareCompose(false);
         }
         return true;

release-notes.md

@@ -20,7 +20,8 @@
   - toggling a **channel's favourite from its context menu** could retarget the menu onto a different channel once the list re-sorted.
 - **A repeater could appear twice** on the discovery scan and in the app — a discover response often arrives more than once (the direct copy plus a re-flooded copy carry different packet hashes, so the mesh's duplicate filter passes both), and each copy was listed. Duplicate copies of the same response are now dropped for a few seconds after the first.
 - **Favourites self-heal** — a pinned favourite whose contact no longer exists (e.g. after clearing contacts) now reverts to an empty **+** tile instead of showing **(gone)**, and the stale pin is cleared from prefs.
-- **Radio preset names no longer seed `{loc}`/`{time}` placeholders** — those only make sense in a message; the preset-name keyboard (Settings › Radio and Tools › Repeater "+ Save current…") now opens empty. The message-slot editor still keeps them.
+- **Radio preset names no longer seed `{loc}`/`{time}` placeholders** — those only make sense in a message; the preset-name keyboard (Settings › Radio and Tools › Repeater "+ Save current…") now opens empty. The message-slot editor still keeps them. The room-login **password** keyboard drops them too.
+- **Room chat opens automatically after a successful login** — logging in to a room server (first-time or a remembered password) used to drop you back on the room list, needing a second **Enter** to actually open the chat. The chat now opens on its own once the login succeeds, as long as you're still on that room in the picker.
 
 ### Under the hood