Minor UI fixes

Author: diegochine

client/app.css

@@ -277,12 +277,6 @@
   flex-shrink: 0;
 }
 
-.bespoke .pl-run-subtitle {
-  margin: 0;
-  color: var(--Colors-Text-Body-Medium);
-  line-height: 1.5;
-}
-
 .bespoke .pl-run-modes {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));

client/index.html

@@ -108,8 +108,6 @@ <h2 class="heading-xsmall">Run Trials</h2>
           </div>
 
           <div class="pl-trial-controls">
-            <p class="pl-run-subtitle body-xsmall">Manual runs a fixed step. Automatic runs continuously until you stop it.</p>
-
             <div class="pl-run-modes" aria-label="Trial run modes">
               <section id="pl-run-mode-manual" class="pl-run-mode" aria-label="Manual stepping">
                 <header class="pl-run-mode-title">
@@ -217,12 +215,11 @@ <h3 class="heading-xxxsmall">Event B</h3>
 
         <section class="box pl-settings-section" id="pl-settings-section-randomness">
           <div class="pl-settings-section-header">
-            <h3 class="heading-xxxsmall">Randomness</h3>
-            <p class="pl-muted body-xsmall">Use a seed to reproduce the same results across runs.</p>
+            <h3 class="heading-xxxsmall">Random seed</h3>
+            <p class="pl-muted body-xsmall">Set a seed to reproduce the same results across runs.</p>
           </div>
 
           <label class="row">
-            <span class="body-small">Seed</span>
             <input id="pl-seed" class="input" type="number" placeholder="42" />
           </label>
         </section>