[Core]: Global search bar across invoices, quotes, and clients

[nielsdrost7]

User story

As a user, I want a global search bar in the company panel so I can quickly find invoices, quotes, clients, and products by number or name without navigating to each module individually.

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Scope

Searchable resources

Resource	Searchable fields
Invoices	invoice_number, customer company_name
Quotes	quote_number, prospect company_name
Clients (Relations)	company_name, relation_number, trading_name
Products	product_name

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Acceptance criteria

• A search input is visible in the company panel top navigation bar.
• Typing 3+ characters triggers a live search across all configured resources.
• Results are grouped by resource type.
• Clicking a result navigates to the record's detail or edit page.
• Search is company-scoped (current tenant only — no cross-tenant data leaks).
• Empty state is shown when no results match.

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Implementation notes

Filament v4 global search is enabled per resource by implementing getGloballySearchableAttributes():

// InvoiceResource.php
public static function getGloballySearchableAttributes(): array
{
    return ['invoice_number', 'customer.company_name'];
}

Each resource that should appear in global search results must implement this method. The panel provider enables global search by default via the top bar.

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Arrange · Act · Assert

#[Test]
public function it_finds_an_invoice_via_table_search(): void
{
    /* Arrange */
    Invoice::factory()->for($this->company)->create(['invoice_number' => 'INV-SEARCH-001']);

    /* Act */
    $component = Livewire::actingAs($this->user)
        ->test(ListInvoices::class, ['tenant' => Str::lower($this->company->search_code)])
        ->searchTable('INV-SEARCH-001');

    /* Assert */
    $component->assertSuccessful();
    $component->assertCountTableRecords(1);
}

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Split from #512, which had an incorrect title ("add search bar") on a body that described date field auto-population. This is the search bar issue; #512 now tracks date field auto-population.