fix: lay the global search sheet out from the top

src/components/__tests__/global-search-layout.test.ts

@@ -0,0 +1,30 @@
+// The global search sheet put its type chips mid-screen, with empty bands
+// above and below, and started the results at about 60% of the height: the
+// chips' horizontal ScrollView grew like flex: 1 in the sheet's column.
+import { describe, expect, it } from 'vitest';
+import fs from 'node:fs';
+import path from 'node:path';
+
+const src = fs.readFileSync(path.resolve(__dirname, '../search/GlobalSearchSheet.tsx'), 'utf8');
+
+function styleBody(name: string): string {
+  const m = new RegExp(`\\n\\s+${name}: \\{([^}]*)\\}`).exec(src);
+  expect(m, `style ${name}`).not.toBeNull();
+  return m![1];
+}
+
+describe('global search sheet layout', () => {
+  it('keeps the chip row to its own height', () => {
+    const scroll = /<ScrollView\s+horizontal([\s\S]*?)>/.exec(src);
+    expect(scroll).not.toBeNull();
+    const style = /\sstyle=\{styles\.(\w+)\}/.exec(scroll![1]);
+    expect(style, 'the horizontal ScrollView needs its own style').not.toBeNull();
+    const body = styleBody(style![1]);
+    expect(body).toMatch(/flexGrow: 0/);
+    expect(body).toMatch(/flexShrink: 0/);
+  });
+
+  it('gives the rest of the sheet to the results', () => {
+    expect(styleBody('results')).toMatch(/flex: 1/);
+  });
+});

src/components/search/GlobalSearchSheet.tsx

@@ -245,7 +245,16 @@ export function GlobalSearchSheet({ visible, initialQuery = '', onClose, navigat
           </View>
         </View>
 
-        <ScrollView horizontal showsHorizontalScrollIndicator={false} contentContainerStyle={styles.chips} keyboardShouldPersistTaps="handled">
+        {/* Its own height only: a horizontal ScrollView grows like flex: 1
+            in a column, which put the chips mid-screen with empty bands
+            above and below and pushed the results down. */}
+        <ScrollView
+          horizontal
+          showsHorizontalScrollIndicator={false}
+          style={styles.chipsScroll}
+          contentContainerStyle={styles.chips}
+          keyboardShouldPersistTaps="handled"
+        >
           {scopes.map((s) => chip(s.key, s.label, scope === s.key, () => setScope(s.key)))}
           {accounts.length > 1 ? (
             <>
@@ -309,6 +318,7 @@ function makeStyles(c: ThemePalette) {
       borderWidth: 1, borderColor: c.border,
     },
     input: { flex: 1, ...typography.body, color: c.text, paddingVertical: spacing.sm },
+    chipsScroll: { flexGrow: 0, flexShrink: 0 },
     chips: { flexDirection: 'row', alignItems: 'center', gap: spacing.xs, paddingHorizontal: spacing.md, paddingVertical: spacing.sm },
     chip: {
       paddingHorizontal: spacing.md, paddingVertical: 6, borderRadius: radius.full,