feat(devices): pure icon resolver + relativeTime helpers

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/views/icon_util.js

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+// public/views/icon_util.js — pure helpers (no DOM), unit-tested.
+const GROUP_DEFAULT = {
+  Network: 'router', Entertainment: 'tv', 'Smart Home': 'plug', Personal: 'phone'
+};
+export function autoDefaultIcon(grp) {
+  return `set:devices:${GROUP_DEFAULT[grp] || 'unknown'}`;
+}
+// Note: bundled 'devices' icons are .svg; brand icons are served .png by the proxy.
+export function resolveIcon(ref) {
+  if (typeof ref !== 'string') return null;
+  let m = ref.match(/^set:([a-z0-9-]+):([a-z0-9-]+)$/);
+  if (m) return `/api/icon-sets/${m[1]}/${m[2]}.svg`;
+  m = ref.match(/^brand:([a-z0-9-]+)$/);
+  if (m) return `/api/icons/${m[1]}.png`;
+  return null;
+}
+export function relativeTime(iso, now = Date.now()) {
+  const t = typeof iso === 'number' ? iso : Date.parse(iso);
+  const s = Math.max(0, Math.floor((now - t) / 1000));
+  if (s < 60) return 'just now';
+  if (s < 3600) return `${Math.floor(s / 60)}m ago`;
+  if (s < 86400) return `${Math.floor(s / 3600)}h ago`;
+  return `${Math.floor(s / 86400)}d ago`;
+}

tests/views/icon_util.test.js

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+import { describe, it, expect } from 'vitest';
+import { resolveIcon, relativeTime, autoDefaultIcon } from '../../public/views/icon_util.js';
+
+describe('autoDefaultIcon', () => {
+  it('maps groups to bundled icons', () => {
+    expect(autoDefaultIcon('Network')).toBe('set:devices:router');
+    expect(autoDefaultIcon('Entertainment')).toBe('set:devices:tv');
+    expect(autoDefaultIcon('Smart Home')).toBe('set:devices:plug');
+    expect(autoDefaultIcon('Personal')).toBe('set:devices:phone');
+    expect(autoDefaultIcon('whatever')).toBe('set:devices:unknown');
+  });
+});
+describe('resolveIcon', () => {
+  it('resolves set + brand refs', () => {
+    expect(resolveIcon('set:devices:router')).toBe('/api/icon-sets/devices/router.svg');
+    expect(resolveIcon('set:mine:nas')).toBe('/api/icon-sets/mine/nas.svg');
+    expect(resolveIcon('brand:apple')).toBe('/api/icons/apple.png');
+  });
+  it('returns null for junk', () => { expect(resolveIcon('nope')).toBeNull(); });
+});
+describe('relativeTime', () => {
+  const base = Date.parse('2026-06-09T12:00:00Z');
+  it('formats buckets', () => {
+    expect(relativeTime('2026-06-09T11:59:30Z', base)).toBe('just now');
+    expect(relativeTime('2026-06-09T11:40:00Z', base)).toBe('20m ago');
+    expect(relativeTime('2026-06-09T09:00:00Z', base)).toBe('3h ago');
+    expect(relativeTime('2026-06-06T12:00:00Z', base)).toBe('3d ago');
+  });
+});