feat: timeline refactor, docking UI, location/state dropdowns, sim_time cleanup

Templates:
- mission_timeline_preview: client-side rendering with lane stacking, wheel zoom,
  drag pan, percentage-based layout, event dedup, scale labels
- asset_detail: dock/undock modals with time selection, future event warning,
  Mission Label column replacing Location/State
- asset_entry_form: all_locations expanded to 72 items (draft board hierarchy),
  all_states dynamic from DB, event point dropdown uses same list
- Remove sim_time from all template url_for links
- base.html: remove Today button

JS:
- app.js: sim_time controls use POST /api/v1/sim-time API instead of URL param

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

app/templates/mission_status_board_preview.html

@@ -90,7 +90,8 @@
                     <p class="mission-summary-text">{{ item.summary }}</p>
 
                     <div class="mission-card-foot">
-                        <a class="table-link" href="{{ url_for('web.asset_list', q=item.name, sim_time=simulation_time_input) }}">查看任务资产</a>
+                        <a class="table-link" href="{{ url_for('web.asset_list', q=item.name
+) }}">查看任务资产</a>
                     </div>
                 </article>
                 {% endfor %}