Hide menu submenus when none of their children are visible

Static submenus and links now inherit visibility from their descendants,
so hardware sections like Touchpad Haptics disappear on machines without
the hardware instead of opening empty. Laptop Display and Mirror Display
are guarded by omarchy-hw-laptop.

The guard evaluator brace-wraps every when/checked condition before
silencing it, so conditions in the jsonc no longer need their own
>/dev/null plumbing, and parents no longer need to repeat their
children's guards.

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

test/shell.d/menu-test.sh

@@ -64,6 +64,20 @@ assert(menu.isDescendantOf(merged.items, 'style.theme', 'style'), 'menu detects
 assertEqual(menu.childCount(merged.items, merged.itemOrder, 'style'), 1, 'menu counts children')
 assertEqual(menu.labelFor({ id: 'style.theme', label: 'Theme', checked: 'cmd' }, { 'style.theme': true }), 'Theme ✓', 'menu appends checked marker')
 
+const visibilityItems = {
+  hardware: menu.normalizeItem('hardware', { label: 'Hardware' }),
+  laptop: menu.normalizeItem('hardware.laptop', { label: 'Laptop', when: 'is-laptop', action: 'toggle-laptop' }),
+  nested: menu.normalizeItem('nested', { label: 'Nested' }),
+  branch: menu.normalizeItem('nested.branch', { label: 'Branch' }),
+  leaf: menu.normalizeItem('nested.branch.leaf', { label: 'Leaf', when: 'has-leaf', action: 'run-leaf' }),
+  dynamic: menu.normalizeItem('dynamic', { label: 'Dynamic', provider: 'items' })
+}
+const visibilityOrder = Object.keys(visibilityItems)
+assert(!menu.isVisible(visibilityItems, visibilityOrder, { 'hardware.laptop': false }, visibilityItems.hardware), 'menu hides a submenu with no visible children')
+assert(menu.isVisible(visibilityItems, visibilityOrder, { 'hardware.laptop': true }, visibilityItems.hardware), 'menu shows a submenu with a visible child')
+assert(!menu.isVisible(visibilityItems, visibilityOrder, { 'nested.branch.leaf': false }, visibilityItems.nested), 'menu hides recursively empty submenus')
+assert(menu.isVisible(visibilityItems, visibilityOrder, {}, visibilityItems.dynamic), 'menu keeps provider-backed submenus visible')
+
 const entry = merged.items['style.theme']
 assert(menu.matchesQuery(entry, 'theme', true), 'menu matches labels and aliases')
 assert(menu.matchesQuery(entry, 'colors', true), 'menu matches aliases')
@@ -122,6 +136,16 @@ assert(
   !defaultById['trigger.toggle.direct-boot'] && !defaultById['trigger.toggle.passwordless-sudo'],
   'menu removes the relocated toggles from Trigger > Toggle'
 )
+assertEqual(
+  defaultById['trigger.hardware.laptop-display'].when,
+  'omarchy-hw-laptop',
+  'menu only shows Laptop Display on laptops'
+)
+assertEqual(
+  defaultById['trigger.hardware.mirror-display'].when,
+  'omarchy-hw-laptop',
+  'menu only shows Mirror Display on laptops'
+)
 assert(
   /font\.family: row\.iconFont\.length > 0 \? row\.iconFont : root\.fontFamily/.test(menuQml),
   'menu rows support per-icon font families'