fix(review): preserve shortcutOverrides across settings saves + keep help modal reachable (PR #146)

- saveAppSettings() rebuilds settings from the DOM; carry over shortcutOverrides
  like showTokenCount/showCost so rebinding survives unrelated saves
- shortcut overlay footer links to the full help modal (its only opener was the
  legacy Ctrl+? route this PR replaced)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/web/public/index.html

@@ -1679,6 +1679,9 @@
         </div>
         <div class="modal-body">
           <div id="shortcutOverlayList"></div>
+          <div class="shortcut-overlay-footer">
+            <button class="btn btn-sm" onclick="app.closeShortcutOverlay(); app.showHelp()">Full shortcut reference</button>
+          </div>
         </div>
       </div>
     </div>

src/web/public/settings-ui.js

@@ -1458,6 +1458,9 @@ Object.assign(CodemanApp.prototype, {
     // with no UI left to turn it back off. Preserve the prior stored preference.
     if (_prev.showTokenCount !== undefined) settings.showTokenCount = _prev.showTokenCount;
     if (_prev.showCost !== undefined) settings.showCost = _prev.showCost;
+    // Shortcut overrides are edited from the Shortcuts tab (not rebuilt from the
+    // general-settings DOM), so the fresh rebuild would drop them on every save.
+    if (_prev.shortcutOverrides !== undefined) settings.shortcutOverrides = _prev.shortcutOverrides;
 
     // Save to localStorage
     this.saveAppSettingsToStorage(settings);

src/web/public/styles.css

@@ -5812,6 +5812,13 @@ kbd {
   color: var(--text-dim);
 }
 
+.shortcut-overlay-footer {
+  margin-top: 0.75rem;
+  padding-top: 0.75rem;
+  border-top: 1px solid var(--border);
+  text-align: right;
+}
+
 .away-digest-ranges {
   display: flex;
   flex-wrap: wrap;