feat: remodelar /sobre conforme mock editorial

Alinha a página Sobre à composição aprovada (hero, pilares, Michele, processo, portfólio, CTA), com foto da Michele via CMS e tokens Heritage Editorial.

Co-authored-by: Cursor <cursoragent@cursor.com>

openspec/changes/remodel-about-page/specs/public-site-pages/spec.md

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+## ADDED Requirements
+
+### Requirement: About page follows approved editorial composition
+
+The `/sobre` route SHALL render the Heritage Editorial public layout with this section order: split hero (eyebrow “Sobre nós”, title “Sobre a Amare”, lead from `about_summary` or editorial default, CTA to `#michele`), three pillars, founder block `#michele` (Michele), process (“Como trabalhamos”), featured portfolio masonry (up to six published featured cases), and a final proposal CTA. The page MUST use shared motion markers (`data-motion="page-open"`, `data-reveal*`) without route transitions. Principles list MUST NOT appear on `/sobre` (home may still show them). Contact, privacy and error surfaces remain unchanged by this requirement.
+
+#### Scenario: Visitor sees the mock section order
+
+- **WHEN** a visitor loads `/sobre`
+- **THEN** the response MUST include the headings for Sobre a Amare, the three pillars, Conheça Michele, Como trabalhamos, Portfólio em destaque, and the proposal CTA copy
+- **AND** MUST NOT render the numbered principles list formerly used on About
+
+#### Scenario: Founder photo comes from CMS when configured
+
+- **GIVEN** `site_settings.founder_image_path` is set with alt text
+- **WHEN** a visitor loads `/sobre`
+- **THEN** the Michele section MUST render that image with the configured alt
+- **AND** MUST use eager loading only for the about hero image, not invent a founder asset path when unset
+
+#### Scenario: About hero uses about_image with tonal fallback
+
+- **WHEN** `about_image_path` is configured
+- **THEN** `/sobre` MUST render a split editorial hero with that media (`loading="eager"` and `fetchpriority="high"`)
+- **WHEN** `about_image_path` is empty
+- **THEN** `/sobre` MUST render a tonal hero fallback without an empty image request
+
+#### Scenario: Featured portfolio tiles use real cases
+
+- **GIVEN** published featured portfolio cases exist
+- **WHEN** a visitor loads `/sobre`
+- **THEN** the masonry MUST link to those cases (or the portfolio index)
+- **AND** MUST NOT invent decorative photography when no cases exist (tonal slots allowed)