fix: hide margin text + recompute lines when WO.apply_margin flips

Two related fixes for the WO-level "Aplică marjă internă" toggle:

== 1. Hide description text when WO toggle is off ==

WorksRelationManager's Total column showed a gray subtitle line
"Bază salariu: 320 MDL · marjă 20%" that persisted even after
apply_margin was toggled OFF at the WO level. Confusing — the user
expected "off means invisible".

Fix: description callback now short-circuits to null when
$record->workOrder->apply_margin === false, hiding the entire text.
Also hides when applied_margin_pct is 0 (nothing meaningful to show).

Result: OFF at WO level → zero margin details anywhere in the
Manopere tab. ON → same as before.

== 2. Auto-recompute salary_base on all lines when toggle flips ==

Previously, salary_base was frozen at line save-time. Flipping
apply_margin from on→off left existing lines with the old
20%-reduced salary_base, so payroll still used the reduced amount
even though the user had visually decided "no margin".

Fix: WorkOrder::updated hook detects wasChanged(['apply_margin',
'override_margin_pct']) and iterates through works():
- apply_margin=false → salary_base = total, applied_margin_pct = 0
- apply_margin=true  → resolver chain (WO override → mechanic → default)

saveQuietly() on each line so we don't retrigger the works() booted
hooks that would recompute again.

This is DIFFERENT semantic from user.internal_margin_pct changes —
those DON'T rewrite history (test still passes). The distinction:
- User margin change: personnel decision, must not touch closed WOs
- WO apply_margin change: explicit per-Fișă decision, must affect
  every line on that same Fișă

InternalMarginRecomputeTest (3):
- Flipping WO.apply_margin off recomputes both existing lines to at-cost
- Flipping back on recomputes to margined
- Changing WO.override_margin_pct recomputes with new % (40 → 60% base)

Suite: 306 passed (853 assertions). Was 303. +3 recompute tests.

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

tests/Feature/InternalMarginRecomputeTest.php

@@ -0,0 +1,89 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Central\Company;
+use App\Models\Central\Plan;
+use App\Models\Tenant\Client;
+use App\Models\Tenant\User;
+use App\Models\Tenant\Vehicle;
+use App\Models\Tenant\WorkOrder;
+use App\Models\Tenant\WorkOrderWork;
+use App\Tenancy\TenantManager;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class InternalMarginRecomputeTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private Company $company;
+    private User $mechanic;
+    private WorkOrder $wo;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $plan = Plan::firstOrCreate(['slug' => 'test'], ['name' => 'T', 'price' => 0, 'features' => []]);
+        $this->company = Company::create(['plan_id' => $plan->id, 'slug' => 'rec-' . uniqid(), 'name' => 'REC', 'status' => 'active']);
+        app(TenantManager::class)->setCurrent($this->company);
+
+        $this->mechanic = User::create(['name' => 'Andrei', 'email' => 'a@e.com', 'password' => bcrypt('x'), 'role' => 'mechanic', 'status' => 'active', 'internal_margin_pct' => 20]);
+        $client = Client::create(['name' => 'C', 'phone' => '+37399000000', 'type' => 'individual', 'status' => 'active']);
+        $vehicle = Vehicle::create(['client_id' => $client->id, 'make' => 'BMW', 'model' => 'X5', 'plate' => 'RC-1']);
+        $this->wo = WorkOrder::create([
+            'number' => WorkOrder::generateNumber($this->company->id),
+            'client_id' => $client->id, 'vehicle_id' => $vehicle->id, 'master_id' => $this->mechanic->id,
+            'opened_at' => today(), 'status' => 'in_work', 'total' => 0,
+        ]);
+    }
+
+    public function test_toggling_wo_apply_margin_off_recomputes_all_existing_lines(): void
+    {
+        // Create 2 lines with margin on (default)
+        $w1 = WorkOrderWork::create(['work_order_id' => $this->wo->id, 'master_id' => $this->mechanic->id, 'name' => 'A', 'hours' => 1, 'price_per_hour' => 250]);
+        $w2 = WorkOrderWork::create(['work_order_id' => $this->wo->id, 'master_id' => $this->mechanic->id, 'name' => 'B', 'hours' => 2, 'price_per_hour' => 200]);
+        // Sanity: salary_base = 80% of total
+        $this->assertEquals(200.00, (float) $w1->salary_base);
+        $this->assertEquals(320.00, (float) $w2->salary_base);
+        $this->assertEquals(20.00, (float) $w1->applied_margin_pct);
+
+        // Flip the toggle OFF at WO level
+        $this->wo->update(['apply_margin' => false]);
+
+        $w1->refresh(); $w2->refresh();
+
+        // Both lines recomputed: salary_base = total, applied_margin_pct = 0
+        $this->assertEquals(250.00, (float) $w1->salary_base);
+        $this->assertEquals(400.00, (float) $w2->salary_base);
+        $this->assertEquals(0.00, (float) $w1->applied_margin_pct);
+        $this->assertEquals(0.00, (float) $w2->applied_margin_pct);
+    }
+
+    public function test_toggling_wo_apply_margin_back_on_recomputes_with_current_margin(): void
+    {
+        $w1 = WorkOrderWork::create(['work_order_id' => $this->wo->id, 'master_id' => $this->mechanic->id, 'name' => 'X', 'hours' => 1, 'price_per_hour' => 250]);
+        $this->wo->update(['apply_margin' => false]);
+        $w1->refresh();
+        $this->assertEquals(250.00, (float) $w1->salary_base);
+
+        // Flip back on
+        $this->wo->update(['apply_margin' => true]);
+        $w1->refresh();
+
+        $this->assertEquals(200.00, (float) $w1->salary_base);
+        $this->assertEquals(20.00, (float) $w1->applied_margin_pct);
+    }
+
+    public function test_changing_wo_override_margin_pct_recomputes_lines(): void
+    {
+        $w = WorkOrderWork::create(['work_order_id' => $this->wo->id, 'master_id' => $this->mechanic->id, 'name' => 'X', 'hours' => 1, 'price_per_hour' => 300]);
+        $this->assertEquals(240.00, (float) $w->salary_base);   // 300 * 0.80 (mechanic's 20%)
+
+        // Set an override at 40% on the WO
+        $this->wo->update(['override_margin_pct' => 40]);
+        $w->refresh();
+        $this->assertEquals(180.00, (float) $w->salary_base);   // 300 * 0.60
+        $this->assertEquals(40.00, (float) $w->applied_margin_pct);
+    }
+}