fix(ui): actionable toasts linger, and a dead hotkey shows in the sidebar

Every toast auto-dismissed after 2.8 s — fine for a success receipt, too
short to read AND act on an error. Errors and warnings now stay 10 s and can
be clicked away; success is unchanged.

The hotkey-conflict warning also needed a trace outside the toast: the ⚠ in
Settings only helps someone who opens the panel. A dot on the sidebar Settings
entry (plus a tooltip) is now the cue in the main UI that a combo is dead.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

css/style.css

@@ -2551,6 +2551,19 @@ body[data-editor-position="center"]:has(#settingsPanel.is-open)::before {
     min-width: 240px;
     animation: toastIn var(--t-base);
 }
+/* Errors / warnings linger — let the user clear them instead of waiting. */
+.toast.is-dismissable { cursor: pointer; }
+/* Settings entry point when a hotkey is dead: a dot the user meets in the
+   normal UI, not only inside the panel they may never open. */
+#settingsBtn.has-alert { position: relative; }
+#settingsBtn.has-alert::after {
+    content: "";
+    position: absolute;
+    top: 6px; right: 8px;
+    width: 7px; height: 7px;
+    border-radius: 50%;
+    background: var(--warning, #e0a800);
+}
 .toast.is-success { border-left-color: var(--success); }
 .toast.is-error { border-left-color: var(--danger); }
 .toast.is-warning { border-left-color: var(--warning); }