gitea: default repo setting; editor: asset picker with thumbnail grid

Gitea plugin: default_repo field per account (stored in DB, pre-fills
create issue form but stays editable). Editor toolbar: asset picker
flyout with 4-column thumbnail grid and live search filter. Clicking
a tile inserts the matching markdown.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

public/plugins/tests/asset-picker.test.js

@@ -0,0 +1,63 @@
+import { describe, it, afterEach, expect, $, $$, click, sleep, closeAll } from './runner.js?v=4';
+
+async function openEditor() {
+    const card = document.querySelector('#board [data-id]');
+    if (!card) return false;
+    card.dispatchEvent(new MouseEvent('dblclick', { bubbles: true }));
+    for (let i = 0; i < 20; i++) {
+        if ($('#modal')?.classList.contains('open')) return true;
+        await sleep(100);
+    }
+    return false;
+}
+
+async function openPicker() {
+    click('#md-asset-picker');
+    for (let i = 0; i < 30; i++) {
+        if (document.getElementById('asset-picker-flyout')) return true;
+        await sleep(100);
+    }
+    return false;
+}
+
+describe('Asset Picker', () => {
+    afterEach(async () => {
+        document.getElementById('asset-picker-flyout')?.remove();
+        await closeAll();
+    });
+
+    it('toolbar button exists', () => {
+        expect($('#md-asset-picker')).toExist();
+    });
+
+    it('opens flyout with search and grid, toggles closed on second click', async () => {
+        if (!await openEditor()) return;
+        if (!await openPicker()) return;
+
+        expect(document.getElementById('asset-picker-flyout')).toExist();
+        expect(document.getElementById('asset-picker-search')).toExist();
+        expect(document.getElementById('asset-picker-grid')).toExist();
+
+        // Second click closes
+        click('#md-asset-picker');
+        for (let i = 0; i < 20; i++) {
+            if (!document.getElementById('asset-picker-flyout')) break;
+            await sleep(50);
+        }
+        expect(document.getElementById('asset-picker-flyout')).toBe(null);
+    });
+
+    it('search input filters tiles', async () => {
+        if (!await openEditor()) return;
+        if (!await openPicker()) return;
+
+        const search = document.getElementById('asset-picker-search');
+        if (!search) return;
+
+        search.value = 'zzz_nonexistent_zzz';
+        search.dispatchEvent(new Event('input', { bubbles: true }));
+        await sleep(50);
+        const grid = document.getElementById('asset-picker-grid');
+        expect(grid.querySelectorAll('.asset-pick-tile').length).toBe(0);
+    });
+});