Bump version to v0.1.8 — Windows playtest fixes

- Fix switchAccount: check signer was set after loginWithNsec before
  returning; fall back to loginWithPubkey on silent failure; always
  navigate to feed after switch to clear stale UI
- Fix profile edit button: hidden in read-only (npub) mode; read-only
  badge shown in profile header to make state visible
- Sidebar: show version number (v0.1.8) below WRYSTR brand, auto-tracked
  from package.json — no more hardcoding
- Support page: increase QR code gap (gap-8 → gap-16) to prevent
  accidentally scanning the wrong address
- ROADMAP: add language/alphabet feed filter to Phase 3 backlog

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

src/components/sidebar/Sidebar.tsx

@@ -3,6 +3,7 @@ import { useFeedStore } from "../../stores/feed";
 import { useUserStore } from "../../stores/user";
 import { getNDK } from "../../lib/nostr";
 import { AccountSwitcher } from "./AccountSwitcher";
+import pkg from "../../../package.json";
 
 const NAV_ITEMS = [
   { id: "feed" as const, label: "feed", icon: "◈" },
@@ -41,7 +42,10 @@ export function Sidebar() {
         ) : (
           /* Expanded: brand on left, collapse chevron on right */
           <>
-            <span className="text-sm font-bold tracking-widest text-text select-none">WRYSTR</span>
+            <div className="flex flex-col">
+              <span className="text-sm font-bold tracking-widest text-text select-none">WRYSTR</span>
+              <span className="text-text-dim text-[9px] font-mono opacity-50">v{pkg.version}</span>
+            </div>
             <button
               onClick={toggleSidebar}
               title="Collapse sidebar"