feat: 5 dramatic extra themes (neon/terminal/blueprint/sunset) + board/review/layout polish

- Themes: add neon (cyber gradient), terminal (green CRT), blueprint (graph
  paper) and sunset (vaporwave) alongside the default Light (Y2K paper) and
  Dark. Theme toggle now cycles all; profile selector lists them; server
  validates against a shared whitelist.
- Bounty cards now show the project (customer) name.
- Remove the celebratory emoji from the empty Review Queue.
- Full-width h1 underline rule; My Tasks columns stack vertically for more
  room per task; card action buttons wrap/right-align so they never overflow.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

web/static/js/board.js

@@ -5,6 +5,7 @@ const grid = document.getElementById('board-grid');
 const errorBox = document.getElementById('error');
 let meId = '';
 let tasks = [];
+const customerNames = new Map();
 
 const esc = (s) => String(s ?? '').replace(/[&<>"']/g, (c) => ({
   '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;',
@@ -25,6 +26,7 @@ async function load() {
     const qs = new URLSearchParams(f).toString();
     const res = await api('GET', '/api/v1/board?' + qs);
     tasks = res.tasks;
+    (res.customers || []).forEach((c) => customerNames.set(c.id, c.name));
     const sel = document.getElementById('f-customer');
     if (sel.options.length === 1) {
       res.customers.forEach((c) => sel.add(new Option(c.name, c.id)));
@@ -58,6 +60,7 @@ function renderCard(t) {
       <span class="badge accent" style="font-size:1rem">◈ ${t.bounty}</span>
       <span>${ageBadge(t)}</span>
     </div>
+    ${customerNames.has(t.customerId) ? `<p class="muted card-project">${esc(customerNames.get(t.customerId))}</p>` : ''}
     <h3 class="mt"><a href="/tasks/${t.id}">${esc(t.title)}</a></h3>
     <p class="muted">${esc((t.description || '').slice(0, 180))}</p>
     <p class="muted">${(t.acceptanceCriteria || []).length} acceptance criteria</p>