Fix Rails/Pluck linting violations from standard-rails 1.6.0

[Copilot]

The standard-rails upgrade from 1.4.0 to 1.6.0 introduced stricter Rails/Pluck enforcement, flagging 39 violations where .map { |element| element[key] } should be replaced with .pluck(key).

Changes

• Applied all 39 Rails/Pluck fixes across 8 test spec files using standardrb auto-correction
• Leverages ActiveSupport's Enumerable extension that adds .pluck() to all Arrays in Rails

Before:

datatable.as_json[:data].map { |d| d[:id] }
fake_topics.map { |topic| topic["question"] }

After:

datatable.as_json[:data].pluck(:id)
fake_topics.pluck("question")

All changes are semantically equivalent - ActiveSupport extends Enumerable with .pluck(), which extracts values from collections of hashes the same way as the map pattern but follows Rails idioms.

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[Copilot]

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