Replace the deprecated v3 string-method forms with the top-level
validator helpers zod 4 prefers:
- z.string().url() → z.url() (3 sites)
- z.string().uuid() → z.uuid() (5 sites)
- z.string().datetime() → z.iso.datetime() (9 sites)
Also swap the ZodIssueCode.custom compat-shim reference in
demo-bot.server.ts's superRefine for the bare string literal "custom",
which is v4's idiomatic form. No runtime change.
All 147 tests still pass.
The `parsed.error.issues.map(i => ({field, message}))` pattern in the
five journal API route handlers stays as-is — the fields we read are
unchanged in v4, and zod's new error helpers (z.treeifyError,
z.prettifyError) produce different shapes that would change our
public API error contract.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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