[style](trx-frontend-http): replace coord sub-line with inline pin button

When a frame carries a position, show a small 📍 button between the
timestamp and callsign on the same line. Title tooltip shows the
coordinates; clicking navigates to the Map tab. Removes the two-line
per-entry layout.

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

@@ -680,9 +680,7 @@ 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);
-  display: flex;
-  flex-direction: column;
-  line-height: 1.3;
+  line-height: 1.45;
   opacity: 1;
 }
 .aprs-bar-frame-main {
@@ -690,13 +688,19 @@ small { color: var(--text-muted); }
   overflow: hidden;
   text-overflow: ellipsis;
 }
-.aprs-bar-frame-pos {
-  line-height: 1.1;
-  margin-bottom: 0.1rem;
+.aprs-bar-pin {
+  background: none;
+  border: none;
+  padding: 0 0.2em 0 0;
+  font-size: 0.85em;
+  line-height: 1;
+  cursor: pointer;
+  vertical-align: middle;
+  opacity: 0.8;
+  transition: opacity 120ms;
 }
-.aprs-bar-frame-pos {
-  display: block;
-  white-space: nowrap;
+.aprs-bar-pin:hover {
+  opacity: 1;
 }
 .aprs-bar-frame + .aprs-bar-frame {
   opacity: 0.72;