[Infra] .github/codecov.yml sets frontend target to 'auto' while backend/contracts use fixed percentages, giving frontend no real coverage floor

[grantfox-oss]

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Why this matters

In .github/codecov.yml, the frontend flag's coverage target is auto (meaning "don't regress from the base commit"), while backend is pinned to 60% and contracts to 70%. A PR that starts from a low-coverage baseline can keep frontend coverage low indefinitely since auto never asks it to reach a fixed floor, unlike the other two flags.

Acceptance criteria

• Decide and document a minimum frontend coverage floor consistent with current frontend coverage
• Update frontend.target in .github/codecov.yml to a fixed percentage (or explicitly document why auto is intentional)
• Verify the Codecov status check still passes on a recent PR

Files to touch

• .github/codecov.yml

Out of scope

• Raising backend/contracts targets
• Adding new coverage flags