fix(ipfs2filecoin): derive the $2.50 rate from USD_PER_TIB_MONTH_PER_COPY

[gmoranxyz]

📝 Description

Follow-up to #1, which called out this exact gap in its description: the $2.50 per TiB per month per copy rate was restated as a string literal in three places instead of being derived from USD_PER_TIB_MONTH_PER_COPY, the same constant the comparison table and cost estimator already use. That left those three spots free to silently drift from the actual priced rate if the constant ever changed.

• Type: Bug fix

🛠️ Key Changes

• constants/seo.ts: the page's meta description now builds its rate mention from formatUsd(USD_PER_TIB_MONTH_PER_COPY) instead of a hardcoded '$2.50' string.
• data/reasons.ts: the "A fraction of pinning-service pricing" reason card description is now a template literal driven by the same constant.
• page.tsx: the rate footnote under the comparison table now interpolates {formatUsd(USD_PER_TIB_MONTH_PER_COPY)} rather than hardcoding $2.50.

All three now match exactly what ComparisonTable and CostEstimator already price off of, so there's a single source of truth for the rate.

📌 To-Do Before Merging

• Confirm rendered output still reads "$2.50" in all three spots (verified in the production build output).

🧪 How to Test

• Setup: npm install && npx next build --webpack, or npm run dev and visit /ipfs2filecoin.
• Steps to Test:
  1. Load /ipfs2filecoin and check the page's <meta name="description"> tag.
  2. Scroll to "Why move to Filecoin warm storage" and read the "A fraction of pinning-service pricing" card.
  3. Scroll to "What it costs" and read the rate footnote under the comparison table.
• Expected Results: All three still read "$2.50 per TiB per month per copy" — same visible copy as before, now computed rather than hardcoded.
• Additional Notes: npx tsc --noEmit shows the same 28 pre-existing, unrelated errors on this branch with and without this change (missing static-asset type declarations elsewhere in the repo); npx biome check is clean on the touched files; npx next build --webpack compiles successfully and statically generates /ipfs2filecoin.

📸 Screenshots

No visual change — the rendered copy is identical, only its source changed from a literal to a derived value.

🔖 Resources

• fix(ipfs2filecoin): estimator beside the table, responsive pricing, hero polish #1 (see "Follow-up (deliberately not in this PR)" in the description)

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