imaging: search now also matches stage name, stage-N, and status

Extended the data-filter attribute to include:
 - friendly stage label (e.g. "awaiting intune lockdown")
 - "stage-N" token (e.g. type "stage-7" to find idx=7 bays)
 - status string (in_progress / succeeded / failed)

Use cases:
 - Find all bays waiting on lockdown: type "lockdown"
 - Find all bays at the same stage: "stage-7"
 - Find failed bays: "failed"
 - Find succeeded bays: "succeeded"

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

webapp/templates/imaging.html

@@ -28,7 +28,7 @@ window.addEventListener('DOMContentLoaded', scheduleImagingReload);
 
 <div class="mb-3">
   <input id="imaging-search" type="search" class="form-control form-control-sm"
-         placeholder="Filter by serial, hostname, pctype, machine#, or Intune device id - typing pauses auto-refresh"
+         placeholder="Filter by serial, hostname, pctype, machine#, Intune id, stage name, stage-N, status - typing pauses auto-refresh"
          autocomplete="off">
 </div>
 
@@ -64,7 +64,7 @@ window.addEventListener('DOMContentLoaded', scheduleImagingReload);
   {% set border = 'danger' if is_failed else ('success' if is_done else 'primary') %}
   {% set friendly = stage_labels.get(stage_idx, ('Stage ' ~ stage_idx, '')) %}
   <details class="card border-{{ border }} mb-2 shadow-sm imaging-card"
-       data-filter="{{ s.serial|lower }} {{ (s.hostname_target or '')|lower }} {{ (s.pctype or '')|lower }} {{ (s.machinenumber or '')|lower }} {{ (s.intune_device_id or '')|lower }}">
+       data-filter="{{ s.serial|lower }} {{ (s.hostname_target or '')|lower }} {{ (s.pctype or '')|lower }} {{ (s.machinenumber or '')|lower }} {{ (s.intune_device_id or '')|lower }} {{ friendly[0]|lower }} stage-{{ stage_idx }} {{ (s.status or 'in_progress')|lower }}">
     <summary class="card-body py-2" style="cursor:pointer; list-style:none;">
       <div class="d-flex flex-wrap gap-3 align-items-center">
         {% if s.intune_device_id %}