test(ui): cover rail exclusion and add the panel-resize QA harness

The right-rail test now proves a .panel-floating panel is neither
measured, allocated nor auto-collapsed while its docked sibling still is.
scripts/qa-panel-resize.mjs drives the CCTV panel in a real browser:
lift-out by header drag, all eight handles with the opposite edge pinned,
minimum size, reload restore and double-click snap-back. Its pure helpers
sit behind a main guard so src/tooling/panelResizeQa.test.mjs can check
them without a browser. Run it with `npm run qa:panel-resize`.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

scripts/qa-panel-resize.mjs

@@ -0,0 +1,285 @@
+#!/usr/bin/env node
+/**
+ * Prove the portable CCTV panel in a real browser: a header drag lifts it out
+ * of the right rail, every resize handle moves only its own edges, minimum
+ * sizes hold, the window survives a reload and a header double-click snaps
+ * it back and forgets the stored position.
+ */
+import assert from 'node:assert/strict';
+import { pathToFileURL } from 'node:url';
+import { RESIZE_DIRECTIONS, resizeBox } from '../src/ui/panelResize.js';
+
+export const PANEL_ID = 'cctv-panel';
+export const STORAGE_KEY = `godsEyeView.v8.panelPos.${PANEL_ID}`;
+export const MIN_SIZE = { width: 300, height: 160 };
+const VIEWPORT = { width: 1400, height: 900 };
+const EDGE_BY_SIDE = { n: 'top', s: 'bottom', e: 'right', w: 'left' };
+
+/** Box edges a resize in `dir` must leave exactly where they were. */
+export function pinnedEdges(dir) {
+  return Object.entries(EDGE_BY_SIDE)
+    .filter(([side]) => !dir.includes(side))
+    .map(([, edge]) => edge);
+}
+
+/** Pointer travel that grows a panel by `amount` on every edge named in `dir`. */
+export function growthDelta(dir, amount) {
+  return {
+    dx: dir.includes('e') ? amount : dir.includes('w') ? -amount : 0,
+    dy: dir.includes('s') ? amount : dir.includes('n') ? -amount : 0,
+  };
+}
+
+/**
+ * Viewport point inside the handle for `dir`, given the panel's client rect.
+ * Edge strips straddle the border by 3px; corners and the grip sit inside.
+ */
+export function handlePoint(rect, dir) {
+  const inset = dir.length === 2 ? 4 : 1;
+  const x = dir.includes('w')
+    ? rect.left + inset
+    : dir.includes('e')
+      ? rect.right - inset
+      : rect.left + rect.width / 2;
+  const y = dir.includes('n')
+    ? rect.top + inset
+    : dir.includes('s')
+      ? rect.bottom - inset
+      : rect.top + rect.height / 2;
+  return { x, y };
+}
+
+/** Edges of `after` that moved although a resize in `dir` should have pinned them. */
+export function driftedEdges(before, after, dir, tolerance = 1.5) {
+  const edges = (box) => ({
+    left: box.left,
+    top: box.top,
+    right: box.left + box.width,
+    bottom: box.top + box.height,
+  });
+  const a = edges(before);
+  const b = edges(after);
+  return pinnedEdges(dir).filter(
+    (edge) => Math.abs(a[edge] - b[edge]) > tolerance,
+  );
+}
+
+function near(actual, expected, tolerance, label) {
+  assert.ok(
+    Math.abs(actual - expected) <= tolerance,
+    `${label}: expected ${expected} ± ${tolerance}, got ${actual}`,
+  );
+}
+
+async function main() {
+  const { default: puppeteer } = await import('puppeteer');
+  const args = process.argv.slice(2);
+  const urlIndex = args.indexOf('--url');
+  const url = urlIndex >= 0 ? args[urlIndex + 1] : 'http://localhost:4173';
+  const browser = await puppeteer.launch({
+    headless: true,
+    executablePath:
+      process.env.PUPPETEER_EXECUTABLE_PATH ||
+      (await puppeteer.executablePath()),
+    args: ['--no-sandbox', '--use-gl=angle', '--use-angle=swiftshader'],
+  });
+  try {
+    const page = await browser.newPage();
+    await page.setViewport(VIEWPORT);
+    const errors = [];
+    page.on('pageerror', (error) => errors.push(error.stack || error.message));
+
+    const boot = async () => {
+      await page.goto(`${url}/`, { waitUntil: 'domcontentloaded' });
+      await page.waitForFunction(() => window.__godsEyeView?.viewer, {
+        timeout: 90_000,
+      });
+      await page.waitForSelector(`#${PANEL_ID} .panel-header`);
+      // The first-run dialog sits over the globe until a choice is made.
+      await page.evaluate(() => {
+        document.querySelector('.first-run-explore')?.click();
+      });
+      await page.keyboard.press('Escape');
+      await page.evaluate(() => {
+        document.getElementById('first-run-launcher')?.remove();
+        for (const node of document.querySelectorAll('[class*=first-run]'))
+          node.remove();
+      });
+      await page.mouse.click(VIEWPORT.width / 2, VIEWPORT.height / 2);
+      await new Promise((resolve) => setTimeout(resolve, 400));
+    };
+    const readPanel = () =>
+      page.evaluate((id) => {
+        const panel = document.getElementById(id);
+        const rect = panel.getBoundingClientRect();
+        return {
+          left: rect.left,
+          top: rect.top,
+          width: rect.width,
+          height: rect.height,
+          floating: panel.classList.contains('panel-floating'),
+          collapsed: panel.classList.contains('collapsed'),
+          inRail: panel.parentElement?.id === 'right-context-rail',
+          allocated: panel.style.getPropertyValue(
+            '--right-panel-allocated-height',
+          ),
+          inlineWidth: panel.style.width,
+          inlineHeight: panel.style.height,
+          stored: localStorage.getItem(`godsEyeView.v8.panelPos.${id}`),
+        };
+      }, PANEL_ID);
+    const headerPoint = async () => {
+      const rect = await page.evaluate((id) => {
+        const title = document.querySelector(
+          `#${id} .panel-header .panel-title`,
+        );
+        const r = title.getBoundingClientRect();
+        return { x: r.left + r.width / 2, y: r.top + r.height / 2 };
+      }, PANEL_ID);
+      return rect;
+    };
+    const drag = async (from, dx, dy) => {
+      await page.mouse.move(from.x, from.y);
+      await page.mouse.down();
+      await page.mouse.move(from.x + dx / 2, from.y + dy / 2, { steps: 6 });
+      await page.mouse.move(from.x + dx, from.y + dy, { steps: 6 });
+      await page.mouse.up();
+      await new Promise((resolve) => setTimeout(resolve, 120));
+    };
+
+    await page.goto(`${url}/`, { waitUntil: 'domcontentloaded' });
+    await page.evaluate((key) => {
+      localStorage.removeItem(key);
+      localStorage.removeItem('godsEyeView.v8.panelFloatHintShown');
+    }, STORAGE_KEY);
+    await boot();
+
+    // Expand CCTV so the panel has a body worth resizing.
+    await page.evaluate((id) => {
+      const panel = document.getElementById(id);
+      if (panel.classList.contains('collapsed'))
+        document
+          .querySelector(`.panel-collapse-btn[data-collapse-target="${id}"]`)
+          .click();
+    }, PANEL_ID);
+    await page.waitForFunction(
+      (id) => !document.getElementById(id).classList.contains('collapsed'),
+      {},
+      PANEL_ID,
+    );
+    await new Promise((resolve) => setTimeout(resolve, 600));
+    const docked = await readPanel();
+    assert.equal(docked.floating, false);
+    assert.equal(docked.inRail, true);
+
+    // Lift out: drag the header 200px left and 100px up.
+    await drag(await headerPoint(), -200, -100);
+    const lifted = await readPanel();
+    assert.equal(lifted.floating, true, 'a header drag lifts the panel out');
+    assert.equal(
+      lifted.collapsed,
+      false,
+      'the drag-ending click must not collapse',
+    );
+    near(lifted.left, Math.max(6, docked.left - 200), 2, 'lifted left');
+    near(lifted.top, Math.max(6, docked.top - 100), 2, 'lifted top');
+    near(lifted.width, docked.width, 2, 'lifted width');
+    await new Promise((resolve) => setTimeout(resolve, 700));
+    const afterLayout = await readPanel();
+    assert.equal(afterLayout.allocated, '', 'the rail no longer allocates it');
+    const railExcludes = await page.evaluate((id) => {
+      const rail = document.getElementById('right-context-rail');
+      const counted = [...rail.children].filter((panel) =>
+        panel.matches('[data-panel-id]:not(.panel-floating):not(.collapsed)'),
+      );
+      return {
+        expandedCount: rail.dataset.expandedCount,
+        counted: counted.length,
+        includesPanel: counted.some((panel) => panel.id === id),
+      };
+    }, PANEL_ID);
+    assert.equal(railExcludes.includesPanel, false);
+    if (railExcludes.expandedCount !== undefined)
+      assert.equal(Number(railExcludes.expandedCount), railExcludes.counted);
+    const storedAfterLift = JSON.parse(afterLayout.stored);
+    assert.equal(storedAfterLift.floating, true);
+    assert.equal(
+      'height' in storedAfterLift,
+      false,
+      'a drag alone must not freeze the measured height',
+    );
+    console.log('PASS: header drag lifts CCTV out of the rail');
+
+    // Every handle moves only its own edges.
+    const limits = {
+      minWidth: MIN_SIZE.width,
+      minHeight: MIN_SIZE.height,
+      viewportWidth: VIEWPORT.width,
+      viewportHeight: VIEWPORT.height,
+    };
+    for (const dir of RESIZE_DIRECTIONS) {
+      const before = await readPanel();
+      const { dx, dy } = growthDelta(dir, 40);
+      await drag(handlePoint(before, dir), dx, dy);
+      const after = await readPanel();
+      const expected = resizeBox(before, dir, dx, dy, limits);
+      for (const key of ['left', 'top', 'width', 'height'])
+        near(after[key], expected[key], 2, `${dir} ${key}`);
+      assert.deepEqual(driftedEdges(before, after, dir, 2), [], `${dir} pins`);
+    }
+    console.log('PASS: eight resize handles keep the opposite edge pinned');
+
+    // Minimum size stops the moving edge.
+    let before = await readPanel();
+    await drag(handlePoint(before, 'se'), -2000, -2000);
+    let after = await readPanel();
+    near(after.width, MIN_SIZE.width, 2, 'min width (se)');
+    near(after.height, MIN_SIZE.height, 2, 'min height (se)');
+    assert.deepEqual(driftedEdges(before, after, 'se', 2), []);
+    before = after;
+    await drag(handlePoint(before, 'nw'), 2000, 2000);
+    after = await readPanel();
+    near(after.width, MIN_SIZE.width, 2, 'min width (nw)');
+    near(after.height, MIN_SIZE.height, 2, 'min height (nw)');
+    assert.deepEqual(driftedEdges(before, after, 'nw', 2), []);
+    console.log('PASS: minimum size holds from both corners');
+
+    // Reload restores the window.
+    const saved = await readPanel();
+    const record = JSON.parse(saved.stored);
+    assert.equal(record.floating, true);
+    await boot();
+    const restored = await readPanel();
+    assert.equal(restored.floating, true, 'floating survives a reload');
+    for (const key of ['left', 'top', 'width', 'height'])
+      near(restored[key], record[key], 2, `restored ${key}`);
+    console.log('PASS: reload restores position and size');
+
+    // Double-click the header to snap back.
+    const point = await headerPoint();
+    await page.mouse.click(point.x, point.y, { clickCount: 1 });
+    await page.mouse.click(point.x, point.y, { clickCount: 2 });
+    await new Promise((resolve) => setTimeout(resolve, 300));
+    const snapped = await readPanel();
+    assert.equal(snapped.floating, false, 'double-click snaps back');
+    assert.equal(snapped.inRail, true);
+    assert.equal(snapped.inlineWidth, '');
+    assert.equal(snapped.inlineHeight, '');
+    assert.equal(snapped.stored, null, 'the storage key is gone');
+    console.log('PASS: header double-click returns the panel to the rail');
+
+    assert.deepEqual(errors, []);
+  } finally {
+    await browser.close();
+  }
+}
+
+if (
+  process.argv[1] &&
+  import.meta.url === pathToFileURL(process.argv[1]).href
+) {
+  main().catch((error) => {
+    console.error(error.stack || error.message);
+    process.exit(1);
+  });
+}