feat(deps): bump zod 3→4 + @hookform/resolvers 3→5

Resolved 65 type errors across the codebase via these v4 migration
patterns:

- `ZodError.errors` renamed to `ZodError.issues` (4 call sites in auth
  routes + central error handler).
- `z.record(value)` now requires explicit key type: `z.record(z.string(),
  value)`. Updated 7 sites across templates / forms / saved-views /
  website-inquiries.
- `.refine(check, msgFn)` second-arg shape changed — now requires an
  `{ error: (issue) => ... }` object form. Updated
  `mergeFieldsSchema` in document-templates validator.
- `.transform(...).default(...)` chains: v4 enforces default value type
  matches transform OUTPUT. Reordered to `.default(...).transform(...)`
  in list-query / company-memberships handlers.
- `z.coerce.*()` INPUT type widened to `unknown` in v4. Service signatures
  using `z.input<typeof schema>` (kept for caller flexibility around
  defaults) now re-parse via `schema.parse(data)` to recover the
  post-coercion shape Drizzle needs. Done in berth-reservations service.
  Invoice service narrows `lineItems` locally with a typed cast since
  re-parsing would double-validate.
- `.optional().transform(...)` no longer propagates the optional marker
  through v4's new ZodPipe. Moved `.optional()` to the END of chain in
  `optionalDesiredDimSchema` (interests) and documents list query
  (folderId, signatureOnly).
- ZodIssue subtype shapes simplified: `received` removed from
  invalid_type, `type` renamed to `origin` on too_small. Test fixtures
  updated.
- @hookform/resolvers v5 splits Resolver into 3-generic form (Input,
  Context, Output). useForm calls in 6 forms (client, yacht, berth,
  interest, expense, invoices-new-page) now pass explicit generics:
  `useForm<z.input<typeof schema>, unknown, z.infer<typeof schema>>`.

Verified: tsc clean (0 errors), vitest 1293/1293 pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/validators/interests.ts

@@ -16,15 +16,19 @@ import {
  * empty strings collapse to `undefined` so a blank form field doesn't
  * round-trip "" → numeric error on the API.
  */
+// In Zod 4, the optional() marker must live at the *outside* of the
+// chain to propagate the field's optional-ness into the parent z.object.
+// In v3 the same pattern worked with optional() in the middle, but v4's
+// new ZodPipe (transform) doesn't forward optional through the pipe.
 const optionalDesiredDimSchema = z
   .union([z.string(), z.number()])
-  .optional()
   .transform((v) => {
-    if (v === undefined || v === null || v === '') return undefined;
+    if (v === '') return undefined;
     const n = typeof v === 'number' ? v : parseFloat(v);
     if (!Number.isFinite(n) || n <= 0) return undefined;
     return String(Math.round(n * 100) / 100);
-  });
+  })
+  .optional();
 
 const desiredUnitSchema = z.enum(['ft', 'm']).optional();