[style](trx-frontend-http): tighten APRS bar entry spacing further

Reduce line-height to 1.05, use 0.1rem vertical padding + hairline
border-bottom to separate entries instead of whitespace.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

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

@@ -690,9 +690,14 @@ small { color: var(--text-muted); }
 .aprs-bar-frame {
   font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
   font-size: clamp(0.58rem, 1.05vw, 0.74rem);
-  line-height: 1.2;
+  line-height: 1.05;
+  padding: 0.1rem 0;
+  border-bottom: 1px solid color-mix(in srgb, var(--border-light) 25%, transparent);
   opacity: 1;
 }
+.aprs-bar-frame:last-child {
+  border-bottom: none;
+}
 .aprs-bar-frame-main {
   white-space: nowrap;
   overflow: hidden;