v6.3.2: Fix expand preview overflow and checkbox visibility

- Card overflow:hidden prevents expand preview from overlapping adjacent cards
- Reduce preview max-height to 200px for better grid fit
- Checkbox only shows on hover when select mode is active (was showing always on hover)
- Add select-mode class to content container for CSS scoping

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: vakovalskii

package.json

@@ -1,6 +1,6 @@
 {
   "name": "codedash-app",
-  "version": "6.3.1",
+  "version": "6.3.2",
   "description": "Dashboard + CLI for Claude Code, Codex & OpenCode sessions. View, search, resume, convert, handoff between agents.",
   "bin": {
     "codedash": "./bin/cli.js"

src/frontend/app.js

@@ -1433,6 +1433,8 @@ function toggleSelectMode() {
   if (!selectMode) selectedIds.clear();
   var btn = document.getElementById('selectBtn');
   if (btn) btn.classList.toggle('active', selectMode);
+  var content = document.getElementById('content');
+  if (content) content.classList.toggle('select-mode', selectMode);
   updateBulkBar();
   render();
 }

src/frontend/styles.css

@@ -378,7 +378,8 @@ body {
     flex-shrink: 0;
     display: none;
 }
-.card:hover .card-checkbox,
+.select-mode .card:hover .card-checkbox,
+.select-mode .card.selected .card-checkbox,
 .card.selected .card-checkbox {
     display: inline-block;
 }
@@ -1614,11 +1615,14 @@ body {
     border-top: 1px solid var(--border);
     margin-top: 10px;
     padding-top: 10px;
-    max-height: 300px;
+    max-height: 200px;
     overflow-y: auto;
     animation: fadeIn 0.2s ease;
 }
 
+/* Ensure card clips expanded content */
+.card { overflow: hidden; }
+
 .card-preview-area.open {
     display: block;
 }