Add two-stage run verification and 24-hour Activity filter

Status now reads "Sent" when the confirmation click lands, since that
only means MassPrice accepted the run request, not that it finished —
their own processing is async and takes anywhere from ~1 to ~22
minutes in observed practice. A new "Complete" column tracks that
separately: run_rule() captures a watermark (the target rule's current
top data-activitylogid on /Activity/List, not the displayed timestamp
string, to sidestep fragile date/timezone parsing) before submitting,
and scheduler.py schedules a one-off verify_run() job
VERIFY_DELAY_MINUTES later to check whether a new "Complete" entry
appeared past that watermark.

rebuild_jobs() now only clears recurring "rule-*" jobs, not the one-off
"verify-*" jobs, so editing a schedule can't cancel a verification
that's already in flight for an earlier run.

Also scopes the Activity page to the last 24 hours per request.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01H6TgffxTvYhqxykAbVQg2v

templates/activity.html

@@ -2,20 +2,35 @@
 {% block title %}Activity · MassPrice Scheduler{% endblock %}
 {% block content %}
 <h1>Activity</h1>
+<p class="muted small">Showing the last 24 hours.</p>
 {% if not history %}
-<p class="empty-state">No runs recorded yet.</p>
+<p class="empty-state">No runs recorded in the last 24 hours.</p>
 {% else %}
 <table class="activity-table">
   <thead>
-    <tr><th>Time</th><th>Rule</th><th>Status</th><th>Message</th></tr>
+    <tr><th>Time</th><th>Rule</th><th>Status</th><th>Complete</th><th>Message</th></tr>
   </thead>
   <tbody>
     {% for entry in history %}
     <tr class="status-row-{{ entry.status }}">
       <td>{{ entry.timestamp }}</td>
       <td>{{ entry.rule_name or entry.rule_id }}</td>
-      <td><span class="status-dot status-{{ entry.status }}"></span>{{ entry.status }}</td>
-      <td class="muted">{{ entry.message }}</td>
+      <td><span class="status-dot status-{{ entry.status }}"></span>{{ entry.status | capitalize }}</td>
+      <td>
+        {% if entry.verification == 'complete' %}
+          <span class="status-dot status-complete"></span>Complete
+        {% elif entry.verification == 'pending' %}
+          <span class="status-dot status-pending"></span>Pending
+        {% elif entry.verification == 'not_confirmed' %}
+          <span class="status-dot status-not-confirmed"></span>Not Confirmed
+        {% else %}
+          <span class="muted">&mdash;</span>
+        {% endif %}
+      </td>
+      <td class="muted">
+        {{ entry.message }}
+        {% if entry.verify_message %}<div class="small">{{ entry.verify_message }}</div>{% endif %}
+      </td>
     </tr>
     {% endfor %}
   </tbody>