feat(filter): :state accepts a list of state names

I made :state polymorphic, mirroring :state-type. A string still compiles to state.name.eq. A list now compiles to state.name.in, so (:state ("Todo" "In Review")) matches issues in either state. The reverse-compile inverts state.name.in back to a scalar (one name) or a list (several), so copy-down no longer refuses a Linear view filtering on a set of named states. The validator accepts a string or a list of non-empty names, the same shape it already enforces for :labels, and a list-valued :state keeps its precedence over :state-type and :open.

Phase 1 of docs/multi-state-filter-spec.org. Suite, compile, and lint green.

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