fix(seo): use 308 (permanentRedirect) for canonical chain URLs#757
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…anonical chain URLs redirect() defaults to 307 which Google treats as temporary - the source URL stays in the index competing with the target. 308 tells Google to consolidate rank signal on the canonical lowercase URL.
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Why
PR #755 used `redirect()` which Next defaults to 307 (temporary). Google treats 307 as "URL still active" and keeps both source + target in the index. For canonical consolidation we need 308 so rank signal flows to the lowercase canonical.
Fix
Swap `redirect` → `permanentRedirect` in `[chain]/page.tsx`.
Test plan after deploy