feat(ui): space + project + home views

Home: recent activity feed from /api/audit/actor?limit=20 with relative
timestamps and entity-typed links into detail views.

Space: header + three-column row of Projects / Open tasks (status=todo) /
Recent pages + refs cards. Status badges on projects and tasks use the
shared .status palette.

Project: header (status + start/complete dates), Tasks card with inline
status badges that cycle todo->doing->blocked->done on click (PATCH
/api/tasks/:id), Pages in space card, Add-task inline form bound to
project_id.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

public/views/space.js

@@ -1,9 +1,80 @@
-// T17 stub — full implementation lands in T19.
+// Space view — header + three columns (projects, recent open tasks, recent pages/refs).
+import { api } from '../api.js';
 import { el, mount } from '../dom.js';
-export async function render(main, ctx) {
-  mount(main,
-    el('h1', { class: 'view-h1' }, 'Space'),
-    el('p', { class: 'view-sub muted' }, 'id: ' + (ctx.params.id || '—')),
-    el('div', { class: 'card muted' }, 'Space view ships in T19.')
+
+function projCard(p) {
+  return el('li', {},
+    el('a', { href: '#/project/' + p.id }, p.name),
+    ' ',
+    el('span', { class: 'status' + (p.status === 'done' ? ' ok' : p.status === 'paused' ? ' warn' : '') }, p.status)
+  );
+}
+
+function taskCard(t) {
+  return el('li', {},
+    el('span', { class: 'status' + (t.status === 'blocked' ? ' bad' : '') }, t.status),
+    ' ', t.title
+  );
+}
+
+function pageCard(p) {
+  return el('li', {}, el('a', { href: '#/page/' + p.id }, p.title));
+}
+
+function refCard(r) {
+  return el('li', {}, el('a', { href: '#/ref/' + r.id }, r.title || r.source_url || '(untitled)'),
+    ' ', el('span', { class: 'status idle' }, r.kind));
+}
+
+export async function render(main, ctx) {
+  const id = ctx.params.id;
+  mount(main,
+    el('h1', { class: 'view-h1' }, 'Space'),
+    el('p', { class: 'view-sub muted' }, 'Loading …')
+  );
+
+  let space;
+  try { space = await api.get('/api/spaces/' + id); }
+  catch (e) {
+    mount(main,
+      el('h1', { class: 'view-h1' }, 'Space not found'),
+      el('p', { class: 'view-sub muted' }, e.message)
+    );
+    return;
+  }
+
+  const [projects, tasks, pages, refs] = await Promise.all([
+    api.get(`/api/spaces/${id}/projects`).catch(() => []),
+    api.get(`/api/spaces/${id}/tasks?status=todo`).catch(() => []),
+    api.get(`/api/spaces/${id}/pages`).catch(() => []),
+    api.get(`/api/refs?space_id=${id}&limit=8`).catch(() => [])
+  ]);
+
+  mount(main,
+    el('h1', { class: 'view-h1' }, space.name),
+    el('p', { class: 'view-sub' }, space.description || el('span', { class: 'muted' }, 'No description.')),
+    el('div', { class: 'row' },
+      el('div', { class: 'card' },
+        el('h3', {}, 'Projects'),
+        projects.length
+          ? el('ul', { class: 'plain' }, projects.map(projCard))
+          : el('p', { class: 'muted' }, 'None yet.')
+      ),
+      el('div', { class: 'card' },
+        el('h3', {}, 'Open tasks'),
+        tasks.length
+          ? el('ul', { class: 'plain' }, tasks.slice(0, 10).map(taskCard))
+          : el('p', { class: 'muted' }, 'Clear board.')
+      ),
+      el('div', { class: 'card' },
+        el('h3', {}, 'Recent pages & refs'),
+        pages.length || refs.length
+          ? el('ul', { class: 'plain' }, [
+              ...pages.slice(0, 6).map(pageCard),
+              ...refs.slice(0, 6).map(refCard)
+            ])
+          : el('p', { class: 'muted' }, 'Nothing here yet.')
+      )
+    )
   );
 }