feat: aplicar spread editorial 5/7 aos heros (#51)

openspec/changes/hero-editorial-spread/specs/content-media/spec.md

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+## ADDED Requirements
+
+### Requirement: Editorial hero media declares its responsive spread width
+Configured narrative hero media SHALL load eagerly with high priority and declare responsive sizes matching the rendered spread: full viewport width below the desktop breakpoint and seven twelfths of the viewport at desktop. Each configured hero image MUST retain meaningful alternative text; a missing image MUST use the tonal fallback without emitting media markup (SPEC §6.4, §6.6).
+
+#### Scenario: A configured hero reports its responsive width
+- **WHEN** a narrative route renders configured hero media
+- **THEN** the image MUST declare `100vw` for smaller viewports and approximately `58vw` for the desktop spread
+- **AND** it MUST use eager loading and high fetch priority
+
+#### Scenario: An unconfigured hero emits no media
+- **WHEN** a narrative route has no hero image path
+- **THEN** the opening MUST not render an image element
+- **AND** it MUST retain its readable tonal content