Initial scaffold: Flask webui + APScheduler + Playwright automation for MassPrice rule scheduling

Drives massprice.tcgplayer.com's Run Rule action per-rule on a
user-configured schedule (multiple times/day, day-of-week toggles),
replacing MassPrice's native scheduler (capped at 15 schedules
account-wide, one run/day, with observed clock drift). Deployed via
Forgejo push-to-deploy on Unraid, matching arr-summary/card-grader.

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

templates/dashboard.html

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+{% extends "_shell.html" %}
+{% block title %}Dashboard · MassPrice Scheduler{% endblock %}
+{% block content %}
+<div class="page-header">
+  <h1>Rules</h1>
+  <div class="page-header-meta">
+    {% if rules_updated_at %}<span class="muted">Rules last synced {{ rules_updated_at }}</span>{% endif %}
+    <button id="refresh-rules" class="btn btn-secondary">Refresh Rules</button>
+  </div>
+</div>
+
+{% if not rules %}
+<p class="empty-state">No rules loaded yet. Click "Refresh Rules" to pull the current rule list from MassPrice.</p>
+{% endif %}
+
+<div class="rule-grid">
+  {% for rule in rules %}
+  <div class="rule-card" data-rule-id="{{ rule.id }}">
+    <div class="rule-card-header">
+      <h2>{{ rule.name }}</h2>
+      <label class="switch" title="Enabled">
+        <input type="checkbox" class="rule-enabled" {{ 'checked' if rule.enabled else '' }}>
+        <span class="slider"></span>
+      </label>
+    </div>
+
+    <div class="rule-last-run">
+      {% if rule.last_run %}
+        <span class="status-dot status-{{ rule.last_run.status }}"></span>
+        Last run {{ rule.last_run.timestamp }} &mdash; {{ rule.last_run.status }}
+        {% if rule.last_run.status == 'failure' %}<div class="muted small">{{ rule.last_run.message }}</div>{% endif %}
+      {% else %}
+        <span class="muted">No runs yet</span>
+      {% endif %}
+    </div>
+
+    <ul class="schedule-list">
+      {% for entry in rule.schedules %}
+      <li class="schedule-chip">
+        <span class="chip-time">{{ entry.time }}</span>
+        <span class="chip-days">{{ entry.days | join(' ') }}</span>
+        <button type="button" class="chip-remove" title="Remove">&times;</button>
+      </li>
+      {% endfor %}
+    </ul>
+
+    <div class="schedule-add">
+      <div class="schedule-add-row">
+        <input type="time" class="new-time" value="06:00">
+        <button type="button" class="btn btn-small add-schedule">Add Time</button>
+      </div>
+      <div class="day-toggles">
+        {% for d in days %}
+        <button type="button" class="day-toggle" data-day="{{ d }}">{{ day_labels[d] }}</button>
+        {% endfor %}
+      </div>
+    </div>
+
+    <div class="rule-actions">
+      <button type="button" class="btn btn-primary run-now">Run Now</button>
+    </div>
+  </div>
+  {% endfor %}
+</div>
+{% endblock %}
+{% block scripts %}
+<script src="{{ url_for('static', filename='js/app.js') }}"></script>
+{% endblock %}