Show affected components on the incident page

[jbrooksuk]

Adds a box at the top of the incident status page listing the components affected by that incident.

What

• A new "Affected Components" box renders at the top of the incident page (status-page/incident.blade.php), above the incident detail.
• Each affected component is rendered with the existing <x-cachet::component> Blade component, so rows look identical to the main status page (name, link, description popover, status badge).
• The box only appears when the incident has components attached.
• Added an affected_components_header translation key (en).

Notes

• The controller already eager-loads $incident->components, so there's no extra query.
• Reuses the same box styling as the component group/ungrouped boxes; all Tailwind classes are already in the compiled CSS, so no asset rebuild is required.

Tests

New tests/Feature/StatusPage/IncidentPageTest.php:

• shows the affected components (and header) when components are attached;
• hides the box when none are attached.

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