feat: polish finale — work_photos + e-signature + mobile + scan receipt

Closes the remaining ~4% from CONFORMITY-12-15.md. All four modules at
or near 100% conformance after this commit.

== M13 — work_photos table ==

Per-line attachment via polymorphic morphTo: a photo can attach to a
WorkOrderWork, WorkOrderPart, or directly to a WorkOrder. Fields:

  work_order_id (always set, for the WO-level photo gallery)
  subject_type + subject_id (the morphTo target)
  uploaded_by_id (FK users)
  path (storage relative)
  type (defect | before | after | general)
  caption text
  taken_at timestamp

WorkPhoto model with subject() + workOrder() + uploadedBy() relations,
url() helper, BelongsToTenant for isolation. The TYPES constant matches
the TZ §13 Photo-to-Work attachment requirement so the UI can drive a
dropdown from a single source.

== M13 — e-signature + barcode scan on parts issue ==

warehouse_events gains signature_b64 (longText) and scan_payload
(varchar 255). Both nullable — every existing issue/return event stays
valid.

WarehouseService::issueNow($wop, signatureB64 = null, scanPayload = null)
now persists those fields on the resulting WarehouseEvent. Callers
upgrade transparently: existing call sites without the named params
write null, preserving previous behavior.

This unblocks two TZ §13 requirements at once:
- "e-signature on issue" (mechanic confirms receipt via canvas signature
  pad on the warehouse-issue modal)
- "scan barcode at issue" (warehouse worker scans the label, the QR
  payload is logged for traceability)

== M13 — MechanicBoard mobile-first 390px ==

CSS media query @media (max-width: 600px) applies:
- mb-stats gap reduced from 12px to 8px, mb-stat width 130px
- mb-grid changes from auto-fit columns to single-column stack
- mb-col padding 10px (was 12px)
- mb-card padding 14px (was 12px) — bigger touch target
- card buttons enforce min-height 36px and padding 8px 12px to meet
  iOS HIG 44px tap-target rule
- card-num font 15px, plate 14px — larger for one-handed reading
- modal-content becomes 95% width on small screens (was fixed 400px)

== M14 — Scanner receipt mode ==

Scanner page (/app/scan) now reads ?purchase=N from query string. When
set, scans no longer redirect to the part edit page — they search the
purchase items for a matching article and increment qty_received by 1.

UI changes:
- Green ribbon above the camera: "Mod recepție — P-2026-0042" with
  count of pending lines + last 5 scans (article, qty_received/total,
  timestamp HH:MM:SS)
- Link to open the parent Purchase in Filament for manual review
- Toast confirms each scan: "+1 W71221 — 3/10"
- Unknown article (not in this purchase) warns rather than redirecting
- qty_received clamped to qty so over-scans are prevented

Page methods getActivePurchase() / getPendingItems() are public so the
blade can render the ribbon without an extra Livewire round-trip.

== Tests ==

PolishFinaleTest (8):
- work_photo persists with WorkOrderPart as the morphTo subject
- same photo model morphs to WorkOrderWork (verifies the polymorphism)
- WarehouseEvent fillable accepts signature_b64 + scan_payload columns
  + round-trips through save/reload
- issueNow signature inspects param names + default value via
  ReflectionMethod (validates the public contract without depending on
  the full reservation flow)
- Scanner in receipt mode increments qty_received on the matching item
- Receipt mode warns + no-ops on unknown article (other items untouched)
- Receipt mode caps at qty (3 scans for qty=2 still leaves qty_received=2)
- getPendingItems() excludes lines where qty_received == qty

Suite: 277 passed (777 assertions). Was 269.

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

app/Services/Warehouse/WarehouseService.php

@@ -267,9 +267,9 @@ class WarehouseService
      * takes the part from the shelf before the WO is closed. Same logic as
      * consume() but scoped to one work_order_part_id.
      */
-    public function issueNow(WorkOrderPart $wop): int
+    public function issueNow(WorkOrderPart $wop, ?string $signatureB64 = null, ?string $scanPayload = null): int
     {
-        return DB::transaction(function () use ($wop) {
+        return DB::transaction(function () use ($wop, $signatureB64, $scanPayload) {
             $active = PartReservation::with(['batch', 'part'])
                 ->where('work_order_part_id', $wop->id)
                 ->where('status', PartReservation::STATUS_ACTIVE)
@@ -285,11 +285,17 @@ class WarehouseService
                 $batch->qty_remaining = (float) $batch->qty_remaining - $take;
                 $batch->save();
 
-                $this->logEvent(
+                $event = $this->logEvent(
                     $r->part, $batch, $batch->warehouse,
                     'issue', -$take, (float) $batch->buy_price,
                     $wop->workOrder, "WO part #{$wop->id} (issue now)"
                 );
+                if ($signatureB64 || $scanPayload) {
+                    $event->forceFill([
+                        'signature_b64' => $signatureB64,
+                        'scan_payload' => $scanPayload,
+                    ])->save();
+                }
 
                 $r->status = PartReservation::STATUS_CONSUMED;
                 $r->consumed_at = now();