feat: Calendar Vizual v2 (Pod×Days matrix) + hidden markup

Implements 2 of the biggest items from /tmp/service/new docs:

== Calendar Vizual v2 (from 02-prototip-calendar-vizual.html) ==

Replaces the FullCalendar week view (the one that visually collapsed after
Livewire re-renders) with a server-rendered matrix that the harness
already drives through Livewire — no third-party JS to clash with Filament.

Layout: 8-column CSS grid (1 row-label + 7 days). Rows are either Posts
(Pod 1, Pod 2…) or active masters depending on toolbar switch. Each
cell holds 0..N event cards.

Per-cell load badge (top-right):
  hours_planned / capacity  →  badge color (gray <50%, orange 50–90%, red ≥90%)

Drag-drop: HTML5 native, Alpine.js holds the dragEventId, moveEvent($id,
$toRowId, $toDate) in PHP updates either post_id or master_id (depending
on groupBy mode) plus date — works seamlessly when re-grouping.

KPI bar (4 cards above toolbar):
- Ore programate X / Y · % capacity
- Fișe deschise (orange)
- Confirmate X/Y (green) + confirmation rate
- No-show alert (red) — scheduled events <24h away that are still unconfirmed

Toolbar:
- ◀ Week ▶ + Astăzi (reset)
- Date label "01 — 07 iunie 2026"
- Grupare switch: Pod ↔ Mecanic
- Filtru: master dropdown + status dropdown (Confirmate/Neconfirmate/În lucru)

Today column highlighted blue; Sunday column hatched as closed
(non-interactive, no drop target); Saturday muted as weekend.

Event card color = master.color (deterministic, matches profile setting),
shown as left border + background tint. Title = client name; meta =
"VW Passat · CIU 001"; time = "08:00–12:00 · V.".

Click empty cell → quick-create panel (right slide-in) with date+pod
pre-filled. Click event → detail panel with Client/Phone/Auto/Plate/
Master/Pod + delete + edit.

Legend section at bottom (mecanici dots, load colors, day states).

== Hidden Markup (from gap-analysis.md #3) ==

Adds `hidden_markup_pct` decimal to parts. Customer documents continue
to show the standard sell_price; the hidden markup is an internal margin
indicator used for B2B contracts and corporate analytics.

Part::internalCostWithHiddenMarkup() returns buy_price * (1 + pct/100).
Falls back to buy_price when pct is null. Decimal:2 cast so persistence
round-trips cleanly.

== Schema migration ==

Idempotent (hasColumn guards):
- posts.hours_per_day decimal(5,1) default 10
- posts.description varchar(255) nullable
- parts.hidden_markup_pct decimal(5,2) nullable

== Tests ==

+11 new in CalendarBoardV2Test (8) + HiddenMarkupTest (3):
- get_days returns 7 days with today flagged + Sunday closed + Saturday weekend
- get_rows returns posts when grouped by post + with capacity
- get_rows returns masters when grouped by master + Fără maistru fallback row
- matrix places events in correct cells + sums hours
- move_event reassigns post_id and date
- create_appt inserts appointment via panel form
- stats compute utilization from events (8h / 60h capacity = 13%)
- status filter narrows to confirmed only
- hidden_markup applies pct correctly + falls back to buy_price + persists

Suite: 196 passed (551 assertions). Was 185.

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

app/Models/Tenant/Part.php

@@ -45,7 +45,7 @@ class Part extends Model implements HasMedia
     protected $fillable = [
         'company_id', 'name', 'article', 'brand', 'category',
         'qty', 'qty_reserved', 'unit', 'min_qty',
-        'buy_price', 'sell_price',
+        'buy_price', 'sell_price', 'hidden_markup_pct',
         'location', 'barcode', 'preferred_supplier_id',
         'is_active', 'is_published', 'notes',
     ];
@@ -56,10 +56,19 @@ class Part extends Model implements HasMedia
         'min_qty' => 'decimal:2',
         'buy_price' => 'decimal:2',
         'sell_price' => 'decimal:2',
+        'hidden_markup_pct' => 'decimal:2',
         'is_active' => 'boolean',
         'is_published' => 'boolean',
     ];
 
+    /** Internal cost+hidden markup (NOT shown to customer). Used for margin analytics + B2B contract pricing. */
+    public function internalCostWithHiddenMarkup(): float
+    {
+        $base = (float) $this->buy_price;
+        $pct = (float) ($this->hidden_markup_pct ?: 0);
+        return round($base * (1 + $pct / 100), 2);
+    }
+
     public function preferredSupplier(): BelongsTo
     {
         return $this->belongsTo(Supplier::class, 'preferred_supplier_id');