fix(meshcore): make strip and body direct children of visuals container

Remove the intermediate #meshcoreMode wrapper div that was breaking the
flex height chain. Strip and body are now direct children of
#meshcoreVisuals (matching the Meshtastic pattern), so flex: 1 propagates
correctly and the content fills the full panel height.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

static/css/modes/meshcore.css

@@ -27,14 +27,8 @@
     gap: 0;
 }
 
-#meshcoreMode {
+/* meshcoreMode is an empty wrapper kept only for JS active-class toggle */
-    display: flex;
+#meshcoreMode { display: none; }
-    flex-direction: column;
-    flex: 1;
-    min-height: 0;
-    overflow: hidden;
-    gap: 0;
-}
 
 /* ── Connection strip ── */
 .meshcore-strip {

templates/partials/modes/meshcore.html

@@ -1,5 +1,8 @@
-{# Meshcore Mode #}
+{# Meshcore Mode
-<div id="meshcoreMode" style="display:flex; flex-direction:column; flex:1; min-height:0; overflow:hidden;">
+   meshcore-strip and meshcore-body are direct children of #meshcoreVisuals,
+   matching the Meshtastic pattern. #meshcoreMode is an empty element kept
+   only so the switchMode JS active-class toggle has something to reference. #}
+<div id="meshcoreMode" style="display:none;"></div>
 
 {# ── Connection Strip ── #}
 <div class="meshcore-strip">
@@ -128,7 +131,6 @@
 
   </div>{# /meshcore-content #}
 </div>{# /meshcore-body #}
-</div>{# /meshcoreMode #}
 
 {# ── Add Contact Modal ── #}
 <div id="meshcoreAddContactModal" class="signal-details-modal" style="display:none;">