Stop advertising VM credits on the Free/Build plan

[tristandubbeld]

Summary

• Stop advertising included VM credits on the Free/Build plan (FREE_PLAN.credits 400 → 0; drop “Up to 40 hours of monthly VM credits”). After deploy, new accounts get 0 free credits; existing free balances are not migrated to 0 immediately.
• Frozen banners, create-Devbox copy, and FAQ no longer tell users credits will refresh next billing cycle. Refund policy still treats workspaces that used more than 400 credits as ineligible, now worded as the “previous allowance of 400 credits.”
• Paid plans unchanged (Pro 1000/100h, Scale 1600/160h). Guard isCloseToOutOfCredits and UsageProgress against 0 included credits.

Linear: CSB-1726 / CSB-1752

Related: server work in CSB-1744; marketing site https://github.com/codesandbox/codesandbox-site/pull/511

Test plan

• Confirm checkout / plan comparison copy for Build shows no 400 credits or 40 hours; Pro still 1000/100h and Scale 1600/160h
• Frozen Free workspace: banner and create-Devbox form say Free workspaces do not include VM credits, and do not mention waiting for the next billing cycle
• Workspace setup FAQ frozen item matches the new copy; refund item uses “previous allowance of 400 credits”
• Free workspace with 0 included credits does not show the “close to out of credits” warning; UsageProgress does not divide by zero
• Paid frozen / spending-limit copy is unchanged

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