Fix language filter — default should be 'all', not 'English'

[realproject7]

Summary

The language filter on the home page defaults to "English" instead of "all". This means non-English stories (Korean, Japanese, Chinese, Spanish, French) are hidden by default. Users have to manually switch the filter to see them.

Root Cause

src/app/page.tsx line 34:

const lang = rawLang === "all" ? "all" : rawLang && (LANGUAGES as readonly string[]).includes(rawLang) ? rawLang : "English";

The fallback should be "all" not "English".

Fix

Change the default from "English" to "all":

const lang = rawLang === "all" ? "all" : rawLang && (LANGUAGES as readonly string[]).includes(rawLang) ? rawLang : "all";

Acceptance Criteria

• Home page shows ALL stories by default (all languages)
• Selecting "English" filter shows only English stories
• Selecting other languages filters correctly
• "All" shows everything

[realproject7]

Fixed via PR #556. Language filter now defaults to 'all' instead of 'English'.