fix(ui): SettingsPage launch-at-login toggle — replace bounce-easing with ease-out-quart

Final impeccable detect cleanup. The launch-at-login toggle thumb in the
Tasks & Rituals section was using cubic-bezier(0.34, 1.56, 0.64, 1) — the
same overshoot bounce that was replaced in Toggle.svelte by commit
6469663. Match the convention here so all toggle animations use the
same exponential ease.

Single-line CSS change. Visual smoke not exercised because the dev
server is winding down between subagents; npm run build confirms the
file still compiles clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/pages/SettingsPage.svelte

@@ -1876,7 +1876,7 @@
                   <span
                     class="absolute top-[3px] left-[3px] w-4 h-4 rounded-full bg-white shadow-sm
                       {settings.launchAtLogin ? 'translate-x-[16px]' : 'translate-x-0'}"
-                    style="transition: transform var(--duration-ui) cubic-bezier(0.34, 1.56, 0.64, 1)"
+                    style="transition: transform var(--duration-ui) cubic-bezier(0.16, 1, 0.3, 1)"
                   ></span>
                 </button>
                 <div class="flex-1 min-w-0">