test(visual): 以规范模式重生成全站视觉基线并补齐 firefox 缺口
改动前全量视觉套件 115 例中 87 例失败，且失败均为尺寸级不匹配（非像素抖动）， 在 dev(:3001) 与 prod(:3002) 两种模式下同样失败。根因：e2e/playwright.config.ts 的 webServer 为 `npm run dev` + reuseExistingServer + url :3000，历史 `test:visual:update` 会静默打在 :3000 的旧生产预览上，跨浏览器基线长期失同步 （同一 / 页 firefox 基线高 6400px vs chromium 10936px）。 按配置意图以 dev 模式在新起 :3001（未复用 :3000）重生成 86 张，并补齐此前缺失的 methodology-fullpage-visual-firefox-desktop.png。逐张比对新旧像素高度，增量均为 本分支自身的收敛型缩减（最大 -15%，无归零/空白帧）。 Gates: 二次全量复跑 115 passed（5 projects × 23 subjects）。
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