[RPP Observations] Constrain local field link click target to content width

Set `display: inline-block` and `width: fit-content`
on .local-field-link to prevent accidental clicks
on whitespace by matching hit area to text width.

Bug:404513462
TEST:Compile Chromium to verify
Change-Id: I386538371e6f431df8c990bcc981b0f8ffb163fd
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6370785
Reviewed-by: Adam Raine <[email protected]>
Reviewed-by: Jack Franklin <[email protected]>
Commit-Queue: Jack Franklin <[email protected]>

Author: hocheung-chromium

front_end/panels/timeline/components/liveMetricsView.css

@@ -131,6 +131,8 @@
 }
 
 .local-field-link {
+  display: inline-block;
+  width: fit-content;
   margin-top: 8px;
 }