feat(layout-review): address Home page review findings

- Findings card no longer truncates silently: panel #1 gains a
  .dt-finding-more overflow control ("Show all 8 findings · 5 more").
- Replace the dead "Files analyzed: 3" stat (restated the section meta
  + visible rows) with "Rows scanned" — info not already on screen.
- Collapsed findings panels use a real .is-collapsed state variant
  instead of inline margin-bottom:-16px hacks, so states can't drift.
- Action bar buttons are content-sized; drop the 340px island that
  jarred against the full-width divider/stats below it.

Branding kept as deliberate landing-style treatment on Home (per
review decision); interior tool pages remain title-only.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

layout-review/home.html

@@ -69,9 +69,9 @@
       </div>
 
       <!-- Action bar -->
-      <div class="dt-btn-row" style="margin-top:16px;max-width:340px">
-        <button class="dt-btn dt-btn-primary">Run analysis</button>
-        <button class="dt-btn">Clear results</button>
+      <div class="dt-btn-row" style="margin-top:16px">
+        <button class="dt-btn dt-btn-primary" style="flex:0 0 auto">Run analysis</button>
+        <button class="dt-btn" style="flex:0 0 auto">Clear results</button>
       </div>
 
       <hr class="dt-divider">
@@ -79,8 +79,8 @@
       <!-- Stats overview -->
       <div class="dt-stats">
         <div class="dt-stat">
-          <div class="dt-stat-label">Files analyzed</div>
-          <div class="dt-stat-value">3</div>
+          <div class="dt-stat-label">Rows scanned</div>
+          <div class="dt-stat-value">48,210 <span class="dt-stat-unit">rows</span></div>
         </div>
         <div class="dt-stat">
           <div class="dt-stat-label">Total findings</div>
@@ -129,11 +129,15 @@
             <p class="dt-finding-meta">3 formats detected · Standardize Formats →</p>
           </div>
         </div>
+
+        <button class="dt-finding-more">
+          <span class="dt-mi">expand_more</span> Show all 8 findings · 5 more
+        </button>
       </div>
 
       <!-- Per-file findings panel #2 (collapsed) -->
-      <div class="dt-card" style="padding-bottom:16px">
-        <div class="dt-finding-group-head" style="margin-bottom:-16px;border-radius:var(--r-lg);border-bottom:none">
+      <div class="dt-card is-collapsed">
+        <div class="dt-finding-group-head is-collapsed">
           <span class="dt-finding-group-chevron">chevron_right</span>
           <span class="dt-severity-dot warn"></span>
           <span class="dt-group-filename">q3_transactions.xlsx</span>
@@ -145,8 +149,8 @@
       </div>
 
       <!-- Per-file findings panel #3 (clean) -->
-      <div class="dt-card" style="padding-bottom:16px">
-        <div class="dt-finding-group-head" style="margin-bottom:-16px;border-radius:var(--r-lg);border-bottom:none">
+      <div class="dt-card is-collapsed">
+        <div class="dt-finding-group-head is-collapsed">
           <span class="dt-severity-dot success"></span>
           <span class="dt-group-filename">vendor_list.csv</span>
           <div class="dt-group-counts">