Keep a long alert title on one line, ending in an ellipsis (0.2.64)

The title label had long_mode: DOT and a width but no height. LVGL 9.5 only
puts the dots on a label whose wrapped text is taller than the label, so the
label grew with its lines and a long title ran into the subtitle. It now has
one line of the headline font as its height (32 px Guition, 21 px CYD).

The Claude skill and the editor's alert tips said the CYD shows about forty
characters of a title; both screens show about twenty.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

screen_manager/app/static/index.html

@@ -570,8 +570,8 @@
         <ul class="alerts-list">
           <li>Use a <b>color per kind of notification</b>: orange for the door, red for
             smoke or water, green for "done". The text always stays dark and readable.</li>
-          <li>Keep the title <b>short</b>; the CYD shows about forty characters on one line.
-            Put details in the subtitle.</li>
+          <li>Keep the title <b>short</b>; a screen shows about twenty characters on one line and
+            ends a longer title with an ellipsis. Put details in the subtitle.</li>
           <li>A <b>custom button text</b> turns the notification into a question: "Coming", "Seen",
             "Turn off". The event then tells you who responded.</li>
           <li>For an alert that resolves itself (the door opens, the laundry gets taken out)