fix(settings): prevent project-level global keys from overriding global settings

getSettingsFast() and getSettings() spread project-level settings over
global settings without filtering by scope. A stale project-level
experimentalFeatures: {} in SQLite would override the global
experimentalFeatures: { insights: true, ... }, making all experimental
features invisible in the dashboard.

Now both methods strip global-only keys from project settings before
the merge, matching the behavior of getSettingsByScopeFast().

Also adds max-height and overflow-y to the overflow dropdown menu.

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

packages/core/src/store.ts

@@ -1645,10 +1645,15 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
       this.globalSettingsStore.getSettings(),
       this.readConfig(),
     ]);
+    // Strip global-only keys from project-level settings so stale project-scoped
+    // values don't override the correct global value during the spread merge.
+    const projectSettings = Object.fromEntries(
+      Object.entries(config.settings ?? {}).filter(([key]) => !isGlobalSettingsKey(key)),
+    );
     return canonicalizeSettings({
       ...DEFAULT_SETTINGS,
       ...globalSettings,
-      ...config.settings,
+      ...projectSettings,
     });
   }
 
@@ -1670,7 +1675,17 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
       this.db.prepare("SELECT settings FROM config WHERE id = 1").get() as { settings?: string } | undefined,
     ]);
 
-    const projectSettings = row?.settings ? fromJson<Settings>(row.settings) : undefined;
+    const raw = row?.settings ? fromJson<Settings>(row.settings) : undefined;
+
+    // Strip global-only keys from the project-level row so stale project-scoped
+    // values (e.g. an empty experimentalFeatures={}) don't override the correct
+    // global value during the spread merge below. getSettingsByScopeFast() has
+    // always done this; getSettingsFast() was missing the filter.
+    const projectSettings: Partial<Settings> | undefined = raw
+      ? (Object.fromEntries(
+          Object.entries(raw).filter(([key]) => !isGlobalSettingsKey(key)),
+        ) as Partial<Settings>)
+      : undefined;
 
     return canonicalizeSettings({
       ...DEFAULT_SETTINGS,