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>

database/migrations/2026_06_06_000001_polish_finale.php

@@ -0,0 +1,46 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        // M13: work_photos polymorphic table (per work line OR per part line OR WO-level)
+        Schema::create('work_photos', function (Blueprint $t) {
+            $t->id();
+            $t->foreignId('company_id')->constrained()->cascadeOnDelete();
+            $t->foreignId('work_order_id')->constrained()->cascadeOnDelete();
+            $t->morphs('subject');                      // WorkOrderWork | WorkOrderPart | WorkOrder
+            $t->foreignId('uploaded_by_id')->nullable()->constrained('users')->nullOnDelete();
+            $t->string('path', 500);                    // storage path
+            $t->string('type', 16)->default('general'); // defect | before | after | general
+            $t->text('caption')->nullable();
+            $t->timestamp('taken_at')->nullable();
+            $t->timestamps();
+            $t->index(['company_id', 'work_order_id']);
+        });
+
+        // M13: e-signature + barcode scan on warehouse events
+        Schema::table('warehouse_events', function (Blueprint $t) {
+            if (! Schema::hasColumn('warehouse_events', 'signature_b64')) {
+                $t->longText('signature_b64')->nullable();
+            }
+            if (! Schema::hasColumn('warehouse_events', 'scan_payload')) {
+                $t->string('scan_payload', 255)->nullable();
+            }
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('work_photos');
+        Schema::table('warehouse_events', function (Blueprint $t) {
+            foreach (['signature_b64', 'scan_payload'] as $col) {
+                if (Schema::hasColumn('warehouse_events', $col)) $t->dropColumn($col);
+            }
+        });
+    }
+};