fix(settings): improve in-page search matching and coverage (#968)

* fix(settings): improve in-page search matching and coverage

Index AudioMuse and individual shortcut rows, tighten fuzzy matching so
junk queries return no hits, and scroll to the parent subsection when a
shortcut result is selected.

* docs: note PR #968 in changelog and settings credits

src/components/settings/settingsSearch.ts

@@ -0,0 +1,54 @@
+import type { TFunction } from 'i18next';
+import { GLOBAL_SHORTCUT_ACTIONS, IN_APP_SHORTCUT_ACTIONS } from '../../config/shortcutActions';
+import { SETTINGS_INDEX, matchScore, type Tab } from './settingsTabs';
+
+export type SettingsSearchHit = {
+  tab: Tab;
+  title: string;
+  focusTitle: string;
+  score: number;
+  key: string;
+};
+
+export function searchSettings(query: string, activeTab: Tab, t: TFunction): SettingsSearchHit[] {
+  const q = query.trim();
+  if (!q) return [];
+
+  const hits: SettingsSearchHit[] = [];
+
+  for (const entry of SETTINGS_INDEX) {
+    const title = t(entry.titleKey as any);
+    const hay = entry.keywords ? `${title} ${entry.keywords}` : title;
+    const score = matchScore(hay, q);
+    if (score <= 0) continue;
+    const focusTitle = entry.focusTitleKey ? t(entry.focusTitleKey as any) : title;
+    hits.push({ tab: entry.tab, title, focusTitle, score, key: entry.titleKey });
+  }
+
+  const inAppSection = t('settings.inputKeybindingsTitle');
+  for (const { id, getLabel } of IN_APP_SHORTCUT_ACTIONS) {
+    const title = getLabel(t);
+    const hay = `${title} ${inAppSection} shortcut hotkey keyboard in-app ${id.replace(/-/g, ' ')}`;
+    const score = matchScore(hay, q);
+    if (score <= 0) continue;
+    hits.push({ tab: 'input', title, focusTitle: inAppSection, score, key: `in-app:${id}` });
+  }
+
+  const globalSection = t('settings.globalShortcutsTitle');
+  for (const { id, getLabel } of GLOBAL_SHORTCUT_ACTIONS) {
+    const title = getLabel(t);
+    const hay = `${title} ${globalSection} shortcut hotkey global media ${id.replace(/-/g, ' ')}`;
+    const score = matchScore(hay, q);
+    if (score <= 0) continue;
+    hits.push({ tab: 'input', title, focusTitle: globalSection, score, key: `global:${id}` });
+  }
+
+  hits.sort((a, b) => {
+    const aCurrent = a.tab === activeTab ? 1 : 0;
+    const bCurrent = b.tab === activeTab ? 1 : 0;
+    if (aCurrent !== bCurrent) return bCurrent - aCurrent;
+    return b.score - a.score;
+  });
+
+  return hits;
+}