feat(deployments): mobile capture wizard + classify hopper + dashboard banner

UI for the pending-deployment workflow (commits 2 + 3 from the plan,
landed together since commit 1 already shipped the full backend).

New surfaces
- /deploy — mobile-first 3-step wizard.  Pick unit → take photo (uses
  <input capture="environment"> so it opens the phone camera) → add
  optional note + submit.  EXIF GPS auto-extracted on the server.
  Success page shows the captured coords + links to either "Deploy
  another" or "View pending hopper."  Whole flow is meant to take
  under 90 seconds on site.
- /tools/pending-deployments — the hopper.  Filter pills: Awaiting /
  Assigned / Cancelled.  Each card shows photo thumbnail, unit serial
  link, captured-at timestamp, coordinates, operator note, and
  status-appropriate actions.
- Classify modal on the hopper: two modes — "Assign to existing
  location" (project + location pickers, scoped to vibration_monitoring)
  or "Create new location" (with new-or-existing project, plus a
  "use captured coords" checkbox that writes the pending row's coords
  onto the new location).  Calls /pending/{id}/promote on submit.
- Cancel button uses prompt() for the optional reason → POSTs to
  /pending/{id}/cancel.

Backend additions
- GET /api/deployments/seismograph-picker — JSON list of non-retired
  seismograph units for the /deploy unit picker.  Annotates each unit
  with has_pending so the picker can flag units that already have a
  pending capture waiting.

Discovery
- New "Field Deploy" + "Pending Deployments" cards on /tools.
- Dashboard banner: auto-shows when there are awaiting captures,
  polled every 30s.  Hides when count drops to 0.  Click → /tools/
  pending-deployments.

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

templates/dashboard.html

@@ -21,6 +21,53 @@
     </div>
 </div>
 
+<!-- Pending-deployments banner — auto-shows when there are field captures
+     awaiting classification.  Hides itself when count is 0.  Polled
+     alongside the rest of the dashboard's 10-second refresh. -->
+<a id="pending-deploy-banner" href="/tools/pending-deployments"
+   class="hidden mb-6 flex items-center justify-between gap-3 p-3 rounded-lg bg-amber-50 dark:bg-amber-900/20 border border-amber-200 dark:border-amber-800 hover:bg-amber-100 dark:hover:bg-amber-900/30 transition-colors">
+    <div class="flex items-center gap-3">
+        <div class="w-9 h-9 rounded-lg bg-amber-100 dark:bg-amber-900/40 text-amber-600 dark:text-amber-400 flex items-center justify-center shrink-0">
+            <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3 8l7.89 5.26a2 2 0 002.22 0L21 8M5 19h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v10a2 2 0 002 2z"/>
+            </svg>
+        </div>
+        <div>
+            <div class="text-sm font-medium text-amber-900 dark:text-amber-200">
+                <span id="pending-deploy-count">0</span> field deployment<span id="pending-deploy-plural">s</span> awaiting classification
+            </div>
+            <div class="text-xs text-amber-700 dark:text-amber-300">Click to pick project / location for these captures</div>
+        </div>
+    </div>
+    <svg class="w-5 h-5 text-amber-600 dark:text-amber-400 shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7"/>
+    </svg>
+</a>
+
+<script>
+async function _refreshPendingDeployBanner() {
+    try {
+        const r = await fetch('/api/deployments/pending?status=awaiting');
+        if (!r.ok) return;
+        const data = await r.json();
+        const banner = document.getElementById('pending-deploy-banner');
+        const countEl = document.getElementById('pending-deploy-count');
+        const pluralEl = document.getElementById('pending-deploy-plural');
+        if (data.count > 0) {
+            countEl.textContent = data.count;
+            pluralEl.textContent = data.count === 1 ? '' : 's';
+            banner.classList.remove('hidden');
+        } else {
+            banner.classList.add('hidden');
+        }
+    } catch (e) {
+        /* silent — banner just stays hidden */
+    }
+}
+_refreshPendingDeployBanner();
+setInterval(_refreshPendingDeployBanner, 30000);
+</script>
+
 <!-- Dashboard cards with auto-refresh -->
 <div hx-get="/api/status-snapshot"
      hx-trigger="load, every 10s"