[fix](trx-frontend-http): eliminate bookmark chip wobble by using compositor-friendly transforms

Batch offsetWidth reads before writes to prevent layout thrashing, and
position chips via transform instead of left to avoid sub-pixel jitter.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

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

@@ -3474,8 +3474,9 @@ button:focus-visible, input:focus-visible, select:focus-visible {
 }
 .spectrum-bookmark-chip {
   position: absolute;
-  transform: translateX(-50%);
   top: 2px;
+  left: 0;
+  will-change: transform;
   cursor: pointer;
   font-weight: 600;
   font-size: 0.66rem;