feat(ui): add /dash route, shared nav, project dashboard with /v1/projects API

Restructure routes: / and /dash show a project overview dashboard,
/activity hosts the existing timeline, /cv remains. Shared Layout
component provides consistent nav header and footer across all routes.

New /v1/projects endpoint aggregates per-repo activity stats (commits,
issues, PRs, date range) from existing event data via SQL. Dashboard
ranks projects by weighted recency + volume score and renders a card
grid.

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

ui/src/pages/TimelineHome.tsx

@@ -1,8 +1,6 @@
 import { useMemo, useState } from 'react';
 import { useQuery } from '@tanstack/react-query';
-import { Link } from 'react-router-dom';
 import Col from 'react-bootstrap/Col';
-import Container from 'react-bootstrap/Container';
 import Row from 'react-bootstrap/Row';
 import { VerticalTimeline } from 'react-vertical-timeline-component';
 
@@ -13,13 +11,6 @@ import { TimelineEntry } from '../components/TimelineEntry';
 const RANGE_MIN = new Date('2010-01-01T00:00:00Z').getTime();
 const RANGE_MAX = Date.now();
 
-const externalLinks: { url: string; alt: string }[] = [
-  { url: 'https://linkedin.com/in/thijssen/', alt: 'linkedin' },
-  { url: 'https://stackoverflow.com/users/68115/grenade', alt: 'stackoverflow' },
-  { url: 'https://github.com/grenade', alt: 'github' },
-  { url: 'https://git.lair.cafe/grenade', alt: 'gitea' },
-];
-
 export function TimelineHome() {
   const [enabledSources, setEnabledSources] = useState<Record<Source, boolean>>({
     github: true,
@@ -61,38 +52,7 @@ export function TimelineHome() {
   const events = eventsQ.data ?? [];
 
   return (
-    <Container className="py-4">
-      <Row className="mb-3">
-        <Col>
-          <h1>hi, i'm rob</h1>
-        </Col>
-        <Col className="d-flex flex-wrap gap-3 justify-content-end align-items-center">
-          {externalLinks.map((el) => (
-            <a
-              key={el.url}
-              href={el.url}
-              title={el.alt}
-              target="_blank"
-              rel="noopener noreferrer"
-            >
-              {el.alt}
-            </a>
-          ))}
-        </Col>
-      </Row>
-      <Row className="mb-4">
-        <Col>
-          <p>
-            i rarely say anything that warrants capital letters. if you're here
-            to see my resume, please go to{' '}
-            <Link className="hot-pink" to="/cv">
-              /cv
-            </Link>
-            . a peek into the projects i'm working on is below.
-          </p>
-        </Col>
-      </Row>
-
+    <>
       <Filters
         enabledSources={enabledSources}
         onSourceToggle={(s, on) =>
@@ -123,6 +83,6 @@ export function TimelineHome() {
           </VerticalTimeline>
         </Col>
       </Row>
-    </Container>
+    </>
   );
 }