Discover dialog: 2s default wait, Enter starts discovery

Focus the dialog on open so Enter works without clicking first.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

connect_dialog.py

@@ -201,7 +201,7 @@ class DiscoverDialog:
             hdr, text="Discover", command=self._do_discover, width=10)
         self._btn_discover.pack(side=tk.RIGHT)
 
-        self._wait_var = tk.StringVar(value="10")
+        self._wait_var = tk.StringVar(value="2")
         ttk.Entry(hdr, textvariable=self._wait_var, width=4, justify="center").pack(
             side=tk.RIGHT, padx=(0, 4))
         ttk.Label(hdr, text="Wait (s):").pack(side=tk.RIGHT, padx=(8, 2))
@@ -248,14 +248,23 @@ class DiscoverDialog:
         self._btn_connect.pack(side=tk.RIGHT, padx=(0, 8))
 
         self._dlg.bind("<Escape>", lambda e: self._dlg.destroy())
+        self._dlg.bind("<Return>", self._on_return)
 
         self._dlg.update_idletasks()
         x = parent.winfo_x() + (parent.winfo_width() - self._dlg.winfo_width()) // 2
         y = parent.winfo_y() + (parent.winfo_height() - self._dlg.winfo_height()) // 2
         self._dlg.geometry(f"+{x}+{y}")
+        self._dlg.lift()
+        self._dlg.focus_force()
+        self._btn_discover.focus_set()
 
     # ── Discovery ──────────────────────────────────────────────────
 
+    def _on_return(self, event=None):
+        if str(self._btn_discover.cget("state")) != "disabled":
+            self._do_discover()
+        return "break"
+
     def _do_discover(self):
         try:
             port_int = int(self._port_var.get().strip())
@@ -265,7 +274,7 @@ class DiscoverDialog:
         try:
             wait_time = max(1, min(60, int(self._wait_var.get().strip())))
         except ValueError:
-            wait_time = 10
+            wait_time = 2
 
         self._btn_discover.config(state="disabled")
         self._status_label.config(text="Discovering devices...", foreground="#666666")