chore: project scaffold, build config, scripts and README

Bun + SvelteKit (static adapter) + Electron project files, icon resources,
dev/e2e/bench scripts and the README documenting the app.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

scripts/perf-large.cjs

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+// How the app feels on a big vault. Not part of `bun run e2e` (it is slow): electron scripts/perf-large.cjs [notes=10000]
+const { app, BrowserWindow } = require('electron');
+const path = require('path');
+const os = require('os');
+const fs = require('fs');
+
+const N = Number(process.argv.find((a) => /^\d+$/.test(a))) || 10000;
+const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'ink-perf-'));
+const vault = path.join(tmp, 'Vault');
+const words = 'alpha beta gamma delta project roadmap meeting notes idea review plan budget design draft summary weekly sync'.split(' ');
+const rnd = (n) => Math.floor(Math.random() * n);
+const sentence = () => Array.from({ length: 8 + rnd(10) }, () => words[rnd(words.length)]).join(' ');
+for (let i = 0; i < N; i++) {
+  const folder = path.join(vault, `Area ${i % 40}`);
+  fs.mkdirSync(folder, { recursive: true });
+  let body = `# Note ${i}\n\n`;
+  for (let p = 0; p < 6; p++) body += sentence() + (rnd(3) === 0 ? ` [[Note ${rnd(N)}]]` : '') + '.\n\n';
+  fs.writeFileSync(path.join(folder, `Note ${i}.md`), `---\ntags: [t${i % 50}]\n---\n\n${body}`);
+}
+for (let a = 0; a < 40; a++) fs.writeFileSync(path.join(vault, `Area ${a}.md`), `Area ${a}\n`);
+app.setPath('userData', tmp);
+fs.writeFileSync(path.join(tmp, 'settings.json'), JSON.stringify({ vault, lastPage: 'Area 1', theme: 'dark', bounds: { width: 1300, height: 850 } }));
+const started = Date.now();
+require('../electron/main.cjs');
+
+const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
+app.whenReady().then(async () => {
+  let win;
+  for (let i = 0; i < 200 && !(win = BrowserWindow.getAllWindows()[0]); i++) await sleep(50);
+  const wc = win.webContents;
+  if (wc.isLoading()) await new Promise((r) => wc.once('did-finish-load', r));
+  const js = (code) => wc.executeJavaScript(`(async () => { ${code} })()`);
+  const report = (label, ms, extra = '') => console.log(`${label.padEnd(40)} ${String(Math.round(ms)).padStart(6)} ms ${extra}`);
+  // frames the page could not draw: longest gap between animation frames over a period
+  const jank = (ms) => js(`let last = performance.now(), worst = 0; const end = last + ${ms}; await new Promise((res) => { const f = (t) => { worst = Math.max(worst, t - last); last = t; t < end ? requestAnimationFrame(f) : res(); }; requestAnimationFrame(f); }); return worst`);
+  const timeIn = (code) => js(`const t = performance.now(); ${code}; return performance.now() - t`);
+  try {
+    for (let i = 0; i < 300; i++) { if (await js(`return !!document.querySelector('.tree .row')`)) break; await sleep(100); }
+    report('launch to sidebar shown', Date.now() - started);
+    report('sidebar rows (folded)', 0, String(await js(`return document.querySelectorAll('.tree .row').length`)));
+    // open every top-level folder
+    const t0 = Date.now();
+    await js(`for (const r of document.querySelectorAll('.tree > .node > .row')) { r.dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowRight', bubbles: true })); }`);
+    await sleep(200);
+    report('open all 40 folders', Date.now() - t0, 'rows now: ' + (await js(`return document.querySelectorAll('.tree .row').length`)));
+    report('worst frame gap after that (1s)', await jank(1000));
+    // open a page that has many backlinks / mentions
+    const o = Date.now();
+    await js(`document.querySelector('.tree .row[data-id="Area 2/Note 2"]')?.click()`);
+    for (let i = 0; i < 100; i++) { if ((await js(`return document.querySelector('.title')?.textContent`)) === 'Note 2') break; await sleep(20); }
+    report('open a page', Date.now() - o);
+    // search
+    const s = Date.now();
+    await js(`document.querySelector('.sidebar button[aria-label="Search"]').click()`);
+    await sleep(100);
+    await js(`const i = document.querySelector('.pal-top input'); i.value = 'roadmap budget'; i.dispatchEvent(new Event('input', { bubbles: true }))`);
+    for (let i = 0; i < 100; i++) { if (await js(`return document.querySelectorAll('.pal-list .pi').length > 3`)) break; await sleep(20); }
+    report('search shows results', Date.now() - s);
+    await js(`document.querySelector('.overlay')?.dispatchEvent(new MouseEvent('mousedown', { bubbles: true }))`);
+    await sleep(400);
+    // graph
+    const g = Date.now();
+    await js(`document.querySelector('.sidebar button[aria-label="Graph view"]').click()`);
+    for (let i = 0; i < 200; i++) { if (await js(`return !!document.querySelector('canvas, .graph svg, .gv')`)) break; await sleep(25); }
+    report('graph view appears', Date.now() - g);
+    report('worst frame gap while it settles (3s)', await jank(3000));
+    await js(`document.querySelector('.sidebar button[aria-label="Graph view"]').click()`);
+    await sleep(500);
+    // tasks list
+    const k = Date.now();
+    await js(`document.querySelector('.sidebar button[aria-label="Tasks"]').click()`);
+    for (let i = 0; i < 100; i++) { if (await js(`return !document.querySelector('.tasks-panel .trash-empty') || false`)) break; await sleep(20); }
+    report('tasks dialog', Date.now() - k);
+  } catch (err) {
+    console.log('harness', err.stack);
+  }
+  fs.rmSync(tmp, { recursive: true, force: true });
+  app.exit(0);
+});