[bug] Language filter defaults to All instead of English on discovery page

[realproject7]

Bug

Discovery page language filter defaults to "All languages" instead of "English" as specified.

Fix

In src/app/page.tsx, change the language fallback from "all" to "English":

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

In src/components/GenreLanguageFilter.tsx, the <LanguageFilter> defaultValue is already driven by active prop, so no change needed there — it will automatically show "English" when the default kicks in.

Files to modify

• src/app/page.tsx — change language fallback to "English"

Acceptance criteria

• Discovery page shows English stories by default (no lang param in URL)
• "All languages" option still works when explicitly selected
• npm run typecheck passes