feat(vue): add mode: "optional" overload for queries with Option input

[Copilot]

Queries had no ergonomic way to conditionally enable/disable based on an optional input value — callers had to manually thread enabled and unwrap the value themselves.

Changes

• New mode: "optional" overload on useQuery_ and useQuery — arg must be a WatchSource<Option<I>> (thunk, ref, or computed); enabled is excluded from options
• Available on API client helpers — the overload is exposed on the outer useQuery type, so it works directly via client.X.query(...) helpers
• Auto-computed enabled — derives computed(() => Option.isSome(...)) and passes it to tanstack; query is disabled when None, enabled when Some
• Auto-unwrapped input — Option.getOrUndefined used as the query input value; safe because tanstack only calls queryFn when enabled is true

Example

const selectedId = computed(() =>
  someRef.value ? Option.some(someRef.value) : Option.none()
)

const [result, data] = client.getItemQuery(selectedId, { mode: "optional" })
// query is disabled when selectedId is None, runs with unwrapped value when Some

[patroza]

@copilot Make available for the query helpers on api clients

[Copilot]

@copilot Make available for the query helpers on api clients

Done in ec01f61 — added the mode: "optional" overload to the outer useQuery type signature (which backs client.X.query). Now you can do:

const selectedId = computed(() => someRef.value ? Option.some(someRef.value) : Option.none())
const [result, data] = client.getItemQuery(selectedId, { mode: "optional" })