Added a Square Feet Calculator tool page with unit switching and i18n keys across locales. | Dev Logs

Date: 2026-01-15 00:00 Summary: Added a Square Feet Calculator tool page with unit switching and i18n keys across locales.

[question] 用户请求：参考HowtoCalculateBMI创建工具： Square feet Calculator - how calculate square feet. 需要支持多国语言，首页入口，以及丰富的介绍内容，使用方法，使用场景。

[try to solve]

• Added src/pages/squareFeetPage.ts: square-feet area calculator with unit switching (feet, meters, inches), plus intro, usage, and use-case copy.
• Registered /tools/square-feet in src/index.ts.
• Added translation keys across existing locale files: tool_squarefeet_*, unit_feet, unit_meters, unit_inches, sqft_unit, and related strings.

[actions]

• Added: src/pages/squareFeetPage.ts
• Updated: src/index.ts
• Updated: src/site/i18n/en.ts, src/site/i18n/zh.ts, src/site/i18n/ru.ts, src/site/i18n/pt.ts, src/site/i18n/ja.ts, src/site/i18n/id.ts, src/site/i18n/fr.ts, src/site/i18n/es.ts, src/site/i18n/de.ts, src/site/i18n/ar.ts