fix(onboarding): require macOS Accessibility grant before first-run completes (#703)

On macOS the hotkey needs Accessibility, but first-run onboarding could finish
after Microphone only and drop users into the main UI with a dead hotkey
("nothing happens when I press the key").

Cause: desktop onboarding gated completion on the hotkey *capability* flag
(requiresAccessibilityPermission). That flag is null while the capability IPC
loads, so requiresAccessibility was briefly false — if Mic got granted in that
window, refresh() called onComplete() before Accessibility was ever requested.
App.tsx's startup gate, by contrast, always requires Accessibility, so the two
disagreed.

Fix: gate completion on the real permission status, mirroring App.tsx — macOS
returns granted/denied, every other platform returns notApplicable, so this is
timing-independent and cross-platform safe. Also surface the Accessibility step
whenever it is denied (macOS-only state) and drop the capability dependency from
its grant button, so the step always appears and is actionable even before the
capability finishes loading.

No change on Windows/Linux/Android (Accessibility = notApplicable there).

Co-authored-by: sim <sim@local>

openless-all/app/src/components/Onboarding.tsx

@@ -293,7 +293,12 @@ function DesktopOnboarding({
     ]);
     setAccessibility(a);
     setMicrophone(m);
-    const aOk = !requiresAccessibility || a === 'granted' || a === 'notApplicable';
+    // Gate on the real permission status — macOS returns granted/denied, other
+    // platforms return notApplicable. This must NOT depend on the hotkey
+    // capability flag: it is null while it loads, so trusting it let mic-only
+    // onboarding finish before we knew macOS needs Accessibility, dropping users
+    // into the app with a dead hotkey. Mirrors the gate in App.tsx.
+    const aOk = a === 'granted' || a === 'notApplicable';
     const mOk = m === 'granted' || m === 'notApplicable';
     if (aOk && mOk) {
       onComplete();
@@ -362,7 +367,7 @@ function DesktopOnboarding({
       >
         <BrandHeader title={t('onboarding.welcome')} desc={t('onboarding.intro')} />
 
-        {requiresAccessibility && (
+        {(requiresAccessibility || accessibility === 'denied') && (
           <PermissionStep
             index={1}
             title={capability?.requiresAccessibilityPermission ? t('onboarding.accessibilityTitle') : t('onboarding.hotkeyTitle')}
@@ -380,13 +385,13 @@ function DesktopOnboarding({
                     : t('onboarding.actionGrant')
             }
             onAction={onGrantAccessibility}
-            disabled={busy || !capability?.requiresAccessibilityPermission || accessibility === 'granted' || accessibility === 'notApplicable'}
+            disabled={busy || accessibility === 'granted' || accessibility === 'notApplicable'}
             hint={capability?.requiresAccessibilityPermission ? t('onboarding.accessibilityHint') : undefined}
           />
         )}
 
         <PermissionStep
-          index={requiresAccessibility ? 2 : 1}
+          index={(requiresAccessibility || accessibility === 'denied') ? 2 : 1}
           title={t('onboarding.micTitle')}
           desc={t('onboarding.micDesc')}
           status={microphone}