feat(WO edit): manopere/piese first + compact header + collapsible sidebar

Three UX changes to /app/work-orders/{id}/edit per user request:

1. Manopere / Piese / Subcontract / Plăți now appear as top-level tabs
2. Header info (Antet, Diagnostic, Foto, Tracking, Plată) is compact
   and collapsed by default
3. Left navigation column can be narrowed via Filament's built-in
   sidebar toggle button

== Relation managers on top ==

EditWorkOrder now enables Filament's combined-tabs mode:
- hasCombinedRelationManagerTabsWithContent() → true
- getContentTabPosition() → ContentTabPosition::After
- getContentTabLabel() → "ⓘ Info & antet"

Result: the WO edit page opens on the Manopere tab (first tab).
Piese, Subcontract, Plăți follow. The full form (Antet, Diagnostic,
Foto, Tracking & ETA, Plată & total) is the last tab, opened only
when the user needs to change header info.

Rationale: mechanics and receptionists spend 90% of their WO edit
time in Manopere/Piese, not in the header. Putting those first cuts
one scroll on every WO open.

== Compact header ==

WorkOrderResource::form restructured:
- "Antet fișă" section: single compact section with 4-column dense
  grid. Contains only the always-visible essentials: Nr., Deschis,
  Status, Urgență, Client (span 2), Auto (span 2), Maistru (span 2),
  Km intrare, Km ieșire. Uses ->compact() to reduce padding.
- Diagnostic / Foto / Tracking & ETA / Plată & total: ALL now
  ->collapsible()->collapsed()->compact(). They appear as closed
  accordions — visible titles but zero screen space until clicked
  open.

Result: opening the "Info & antet" tab shows a tight 4-column top
row + 4 closed accordion titles below. Fits in ~40% the vertical
space of the previous layout.

== Sidebar collapsible on desktop ==

TenantPanelProvider ->sidebarCollapsibleOnDesktop() — Filament adds
a chevron button that toggles the left nav between full-width labels
and icon-only strip. Persisted per user via localStorage.

Result: user can narrow the left column with one click when they
want more horizontal space for a wide Manopere table.

No schema changes. No test changes required (existing WO tests still
pass — 303/303).

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

app/Filament/Tenant/Resources/WorkOrderResource/Pages/EditWorkOrder.php

@@ -12,6 +12,23 @@ class EditWorkOrder extends EditRecord
 {
     protected static string $resource = WorkOrderResource::class;
 
+    /** Manopere / Piese / Subcontract / Plăți se afișează SUS ca taburi, apoi antetul. */
+    public function hasCombinedRelationManagerTabsWithContent(): bool
+    {
+        return true;
+    }
+
+    public function getContentTabLabel(): ?string
+    {
+        return 'ⓘ Info & antet';
+    }
+
+    public function getContentTabPosition(): ?\Filament\Resources\Pages\Enums\ContentTabPosition
+    {
+        // Puts the form (content) AFTER all relation manager tabs
+        return \Filament\Resources\Pages\Enums\ContentTabPosition::After;
+    }
+
     protected function getHeaderActions(): array
     {
         return [