chore(release): 1.4.0

[thomaschristory]

Release v1.4.0 — three user-facing features merged under the milestone.

Included

• feat(tui): individually selectable custom-field columns (feat(tui): list individual custom fields as selectable columns #121, closes TUI/CLI: select individual custom fields as columns (not just the whole custom_fields object) #118)
• feat(search): local saved searches (feat(search): local saved filter sets (saved searches) #123, closes TUI/CLI: support saved searches (saved filter sets) #119)
• feat(output): NetBox object colors with an independent toggle (feat(output): render NetBox object colors with an independent toggle #122, closes TUI/CLI: render NetBox object colors (role/tag/etc.) with a toggle to disable #120)

Release mechanics

• Version bumped to 1.4.0 in pyproject.toml, nsc/_version.py, uv.lock.
• CHANGELOG ## v1.4.0 section added.
• README gains an "Object colors" subsection.

Tag v1.4.0 will be pushed to main HEAD after merge to trigger the PyPI publish.

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