feat: content-UX — header search, metadata de-noise, icon/microcopy coherence, article composition

src/pages/proposals.astro

@@ -7,14 +7,14 @@ import Base from '../layouts/Base.astro';
     <div class="container hero">
       <div class="eyebrow">Proposal Submission</div>
       <h1>Observation proposals</h1>
-      <p>Submitting observation proposals, including ToO / MWL requests</p>
+      <p>Submit observation proposals, including ToO and MWL requests</p>
     </div>
   </section>
 
   <section class="band--moon">
     <div class="container page">
     <span class="badge-mock">Mock — no submission logic</span>
-    <span class="badge-ext">Target: Proposal Handling System (APC team) integrated into the portal</span>
+    <span class="badge-ext">Planned integration: Proposal Handling System (APC team)</span>
     <div class="panel panel--narrow">
       <div class="form-row">
         <label for="f-title">Proposal title</label>
@@ -42,7 +42,7 @@ import Base from '../layouts/Base.astro';
       </div>
       <div class="form-row">
         <label for="f-just">Scientific justification</label>
-        <textarea id="f-just" rows="4" placeholder="Brief description of the observation goal..."></textarea>
+        <textarea id="f-just" rows="4" placeholder="Brief description of the observation goal…"></textarea>
       </div>
       <button class="btn" type="button">Submit proposal</button>
       <p class="notice">Demonstration mock — the form does not store any data.</p>