chore(fe): migrate frontend filter types to shared zod schemas

[andrewwallacespeckle]

Ensures type safety between frontend and backend for viewer filtering system.

Shared package:

• Added Zod schemas for all filter condition types (NumericFilterCondition, StringFilterCondition, BooleanFilterCondition, ExistenceFilterCondition)
• Added runtime value objects (*Values) for use with Object.values()
• Export validation helpers: parseSerializedFilters(), parseQueryCriteria()
• Export discriminated union type SerializedFilterData for type-safe filter serialization

Frontend:

• Replaced local enum definitions with imports from @speckle/shared/viewer/filters
• Maintained backward compatibility via const objects that support dot notation (e.g., NumericFilterCondition.IsBetween)
• Updated getConditionsForType() to use new *Values objects