Increase Large/XL font sizes, enlarge account switcher, fix relay drop and bookmark persistence

- Large font 16→17px, Extra Large 18→20px
- Account avatar w-8→w-10, name and arrow text larger
- resetNDK preserves outbox-discovered relay URLs instead of dropping to fallback 3
- BookmarkView merges relay results with cache instead of replacing, so cached notes survive timeouts

src/components/sidebar/AccountSwitcher.tsx

@@ -153,12 +153,12 @@ export function AccountSwitcher() {
               className="flex items-center gap-2 flex-1 min-w-0 cursor-pointer hover:opacity-80 transition-opacity"
               onClick={() => openProfile(pubkey)}
             >
-              <Avatar account={current} size="w-8 h-8" textSize="text-[12px]" />
-              <span className={`text-[12px] font-medium truncate flex-1 ${loggedIn ? "text-text" : "text-text-muted"}`}>{displayName(current)}</span>
+              <Avatar account={current} size="w-10 h-10" textSize="text-[14px]" />
+              <span className={`text-[14px] font-medium truncate flex-1 ${loggedIn ? "text-text" : "text-text-muted"}`}>{displayName(current)}</span>
             </div>
             <button
               onClick={() => setOpen((v) => !v)}
-              className="text-text-dim hover:text-text text-[10px] transition-colors px-0.5"
+              className="text-text-dim hover:text-text text-[14px] transition-colors px-1"
               title="Switch account"
             >
               {open ? "▲" : "▼"}