[fix](trx-frontend): tighten two-state step scale toggle

Resize the step scale control so it reads as a balanced two-option toggle instead of a leftover segmented control.

Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-client/trx-frontend/trx-frontend-http/assets/web/style.css

@@ -417,19 +417,22 @@ button:disabled { opacity: 0.6; cursor: not-allowed; }
   justify-content: flex-end;
 }
 .jog-mult {
-  display: flex;
+  display: inline-grid;
+  grid-template-columns: repeat(2, minmax(0, auto));
   border: 1px solid var(--border-light);
   border-radius: 6px;
   overflow: hidden;
   height: 3.35rem;
   flex-shrink: 0;
+  width: auto;
 }
 .jog-mult button {
+  min-width: 3.15rem;
   border: none;
   border-right: 1px solid var(--border-light);
   border-radius: 0;
   height: 100%;
-  padding: 0 0.5rem;
+  padding: 0 0.7rem;
   font-size: 0.85rem;
   background: var(--input-bg);
   color: var(--text-muted);