ludic.ui: emit click reaches on-click, and a select's < steps back

From the user's play: clicking an item in the pack opened nothing, and the wardrobe's picks did
not respond - both are a component whose button says `emit click` (ItemCell, LookCell, ListRow),
answered by its user's on-click. An on-* attribute's name is kept as a browser would have it, so
on-click is on-press (tpl_event), and the emit looked for "click" and found nothing. An emitted
name now goes through the same tpl_event.

And a settings cycler's left arrow did the right one's job: any press let go on a select stepped it
forward. ct_activate_at steps back when it is let go over the select's .ui-prev; Enter and the rest
of the select still step forward.

Goldens ui_emit_click (the mouse and a press both reach on-click; with the toolchain before this,
neither does) and ui_select_arrows (1 -> 0 on <, then 2 on > >; before this, 1 -> 2 on <). The 33
ui examples pass.

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

examples/library/ui_emit_click_parts/Cell.lss

@@ -0,0 +1 @@
+.cell { width: 100px; height: 40px }

examples/library/ui_emit_click_parts/Cell.ludic

@@ -0,0 +1,3 @@
+component Cell {
+  prop caption: string = ""
+}

examples/library/ui_emit_click_parts/Cell.xml

@@ -0,0 +1,3 @@
+<div class="item">
+  <button class="cell" on-click="emit click"><p>{caption}</p></button>
+</div>

examples/library/ui_emit_click_parts/Pick.lss

@@ -0,0 +1 @@
+div { width: 400px }

examples/library/ui_emit_click_parts/Pick.ludic

@@ -0,0 +1,4 @@
+component Pick {
+  state got: int = -1
+  on pick(i: int) { got = i }
+}

examples/library/ui_emit_click_parts/Pick.xml

@@ -0,0 +1,5 @@
+<div>
+  <p>got {got}</p>
+  <Cell caption="a" on-click="pick(1)"/>
+  <Cell caption="b" on-click="pick(2)"/>
+</div>