feat(app): add i18n internationalization support

[jwaterwater]

feat(app): add i18n internationalization support

• Add @solid-primitives/i18n dependency
• Create i18n infrastructure (context, hooks, locale files)
• Support 5 languages: English, 简体中文, 日本語, Français, Español
• Auto-detect browser language
• Add language switcher dialog (sidebar settings gear icon)
• Translate home page
• Translate sidebar layout (including command palette)
• Translate session-related pages (session-header, session-new-view)

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on my search, I found a related PR:

Potential Duplicate:

• PR feat(i18n): add internationalization with Korean translations #6776: feat(i18n): add internationalization with Korean translations (feat(i18n): add internationalization with Korean translations #6776)

This PR appears to be addressing the same feature (i18n internationalization support). PR #6776 seems to be an earlier implementation, and PR #7290 may be an updated or expanded version with additional language support (including Korean translations in #6776 context).

Note: PR #1581 (feat: implement comprehensive Chinese translation support) is less likely to be a direct duplicate as it appears to be an older, more limited implementation.

[jwaterwater]

I believe the OpenCode DeskTop should be aimed at non-programmers. I am also preparing to use OpenCode to develop products for non-programmers, so language support seems essential.

[adamdotdevin]

@jwaterwater please add some screenshots

[jwaterwater]

Sure