feat: launch readiness — PWA, API hardening, memory leak fixes, sticker removal

- Add PWA infrastructure: vite-plugin-pwa, manifest, service worker,
  SW update prompt component, placeholder icons, Apple meta tags
- Harden API client: 401 auto-logout, AbortController timeouts
  (30s standard, 120s uploads), onUnauthorized callback
- Fix memory leaks: clear voice user status on leave, clean up all
  Maps (channelToSpaceMap, permissions, etc.) on removeSpace
- Upgrade error boundary to Aether Drift design with Try Again button,
  collapsible stack trace, and componentDidCatch logging
- Configure desktop icon paths in electron-builder.yml
- Remove sticker feature (server routes, schema, types, UI components)
- Fix Docker build: use **/node_modules in .dockerignore to prevent
  COPY from clobbering pnpm-installed workspace dependencies
- Add vite-env.d.ts declarations for noise suppressor wasm imports
- Exclude test files from tsc build via tsconfig

packages/web/src/components/modals/SpaceSettings.tsx

@@ -10,7 +10,6 @@ import { OverviewPanel } from './spaceSettingsPanels/OverviewPanel';
 import { MembersPanel } from './spaceSettingsPanels/MembersPanel';
 import { RolesPanel } from './spaceSettingsPanels/RolesPanel';
 import { BansPanel } from './spaceSettingsPanels/BansPanel';
-import { StickersPanel } from './spaceSettingsPanels/StickersPanel';
 import type { SpaceVisibility, JoinRequest } from '@backspace/shared';
 
 function DiscoveryPanel({ spaceId }: { spaceId: string }) {
@@ -271,7 +270,7 @@ export function SpaceSettingsModal() {
   const spaces = useSpaceStore((s) => s.spaces);
   const spacePermissions = useSpaceStore((s) => s.spacePermissions);
 
-  const [tab, setTab] = useState<'overview' | 'discovery' | 'stickers' | 'members' | 'roles' | 'bans'>('overview');
+  const [tab, setTab] = useState<'overview' | 'discovery' | 'members' | 'roles' | 'bans'>('overview');
 
   const isOpen = activeModal === 'spaceSettings';
   const space = spaces.find(s => s.id === currentSpaceId);
@@ -301,11 +300,6 @@ export function SpaceSettingsModal() {
                 Discovery
               </button>
             )}
-            {canManageSpace && (
-              <button onClick={() => setTab('stickers')} className={tabClass('stickers')}>
-                Stickers
-              </button>
-            )}
             <button onClick={() => setTab('members')} className={tabClass('members')}>
               Members
             </button>
@@ -326,7 +320,6 @@ export function SpaceSettingsModal() {
         <div className="flex-1 min-w-0 overflow-y-auto scrollbar-thin">
           {tab === 'overview' && <OverviewPanel spaceId={currentSpaceId} />}
           {tab === 'discovery' && canManageSpace && <DiscoveryPanel spaceId={currentSpaceId} />}
-          {tab === 'stickers' && canManageSpace && <StickersPanel spaceId={currentSpaceId} />}
           {tab === 'members' && <MembersPanel spaceId={currentSpaceId} />}
           {tab === 'roles' && canManageRoles && <RolesPanel spaceId={currentSpaceId} />}
           {tab === 'bans' && canBanMembers && <BansPanel spaceId={currentSpaceId} />}