fix(skills): per-card loading state on skill enable (#454)

* feat(settings,skills): reorganize settings and skills pages for consistency and usability

- Remove dead code: TauriCommandsPanel, useSettingsAnimation, SettingsPanelLayout,
  SettingsBackButton, ProfilePanel, AdvancedPanel, SkillsPanel, SkillsGrid (~1900 lines)
- Standardize settings panel padding to p-4 space-y-4 across all panels
- Add breadcrumb navigation to SettingsHeader with route-derived breadcrumbs
- Decompose oversized panels: LocalModelPanel, AutocompletePanel, CronJobsPanel,
  ScreenIntelligencePanel into sub-components in dedicated subdirectories
- Deduplicate skills management: move browser access toggle to Skills page,
  remove redundant /settings/skills route
- Unify skill card layout: UnifiedSkillCard component with overflow menu for
  secondary actions, consistent status/CTA patterns across all skill types
- Add skill search bar and category filter with grouped results

Closes #396

* fix(settings,skills): address CodeRabbit review feedback

- Use semantic nav/ol/li for breadcrumbs with aria-hidden separators
- Fix duplicate text-xs class in CompletionStyleSection
- Use interface instead of type for CronSkillConfig
- Disable cron option inputs when parent skill is disabled
- Deduplicate preset error rendering in DeviceCapabilitySection
- Fix low-contrast labels: text-stone-300 → text-stone-700, text-stone-200 → text-stone-600
- Disable "Set Path" button when input is empty
- Add aria-pressed to category filter buttons
- Convert SkillCategoryFilter to arrow function
- Use void operator for async onClick handler
- Simplify redundant conditional in ThirdPartySkillCard
- Use async/await instead of .then() in BrowserAccessToggle

* fix(tests): update Skills page tests for unified card layout

- Mock openhumanGetRuntimeFlags/openhumanSetBrowserAllowAll for BrowserAccessToggle
- Open overflow menu before clicking sync/debug buttons (now in secondary actions)
- Remove assertion for deleted "3rd Party Skills" heading

* fix(skills): show per-card loading state instead of hiding entire skill list on enable

When clicking Enable on a third-party skill (e.g. Gmail, Notion), the
entire skill list was replaced with a loading message. Now only the
clicked card's button shows "Enabling..." with a disabled state while
the install RPC runs, keeping all other cards visible and interactive.

app/src/components/skills/SkillCard.tsx

@@ -39,6 +39,7 @@ export interface UnifiedSkillCardProps {
     metricsText?: string;
   };
   syncSummaryText?: string;
+  ctaDisabled?: boolean;
 }
 
 const CTA_STYLES: Record<string, string> = {
@@ -60,6 +61,7 @@ export function UnifiedSkillCard({
   secondaryActions,
   syncProgress,
   syncSummaryText,
+  ctaDisabled,
 }: UnifiedSkillCardProps) {
   const [menuOpen, setMenuOpen] = useState(false);
   const menuRef = useRef<HTMLDivElement>(null);
@@ -164,11 +166,12 @@ export function UnifiedSkillCard({
         )}
         <button
           type="button"
+          disabled={ctaDisabled}
           onClick={e => {
             e.stopPropagation();
             onCtaClick();
           }}
-          className={`flex-shrink-0 rounded-lg border px-3 py-1.5 text-[11px] font-medium transition-colors ${ctaStyle}`}>
+          className={`flex-shrink-0 rounded-lg border px-3 py-1.5 text-[11px] font-medium transition-colors ${ctaStyle} ${ctaDisabled ? 'opacity-50 cursor-not-allowed' : ''}`}>
           {ctaLabel}
         </button>
       </div>
@@ -180,9 +183,10 @@ export function UnifiedSkillCard({
 interface ThirdPartySkillCardProps {
   skill: SkillListEntry;
   onSetup: () => void;
+  isInstalling?: boolean;
 }
 
-export function ThirdPartySkillCard({ skill, onSetup }: ThirdPartySkillCardProps) {
+export function ThirdPartySkillCard({ skill, onSetup, isInstalling }: ThirdPartySkillCardProps) {
   const connectionStatus = useSkillConnectionStatus(skill.id);
   const statusDisplay = STATUS_DISPLAY[connectionStatus] ?? STATUS_DISPLAY.offline;
   const skillState = useSkillState<SkillHostConnectionState & Record<string, unknown>>(skill.id);
@@ -239,6 +243,7 @@ export function ThirdPartySkillCard({ skill, onSetup }: ThirdPartySkillCardProps
   }
 
   function ctaLabel(): string {
+    if (isInstalling) return 'Enabling...';
     switch (connectionStatus) {
       case 'offline': return 'Enable';
       case 'setup_required': return 'Setup';
@@ -305,6 +310,7 @@ export function ThirdPartySkillCard({ skill, onSetup }: ThirdPartySkillCardProps
         statusColor={statusDisplay.color}
         ctaLabel={ctaLabel()}
         ctaVariant={ctaVariant()}
+        ctaDisabled={isInstalling}
         onCtaClick={() => onSetup()}
         secondaryActions={secondaryActions}
         syncProgress={

app/src/pages/Skills.tsx

@@ -353,11 +353,9 @@ export default function Skills() {
               onChange={setSelectedCategory}
             />
 
-            {skillsLoading || installing ? (
+            {skillsLoading ? (
               <div className="py-8 text-center">
-                <p className="text-sm text-stone-400">
-                  {installing ? `Installing ${installing}...` : 'Loading skills...'}
-                </p>
+                <p className="text-sm text-stone-400">Loading skills...</p>
               </div>
             ) : filteredItems.length === 0 ? (
               <div className="py-8 text-center">
@@ -406,6 +404,7 @@ export default function Skills() {
                         <ThirdPartySkillCard
                           key={item.id}
                           skill={item.skill!}
+                          isInstalling={installing === item.id}
                           onSetup={() => openSkillSetup(item.skill!)}
                         />
                       );