feat(tui): custom-field labels, detail-view list rendering, bulk-edit polish (#132, #133, #134)

[thomaschristory]

Closes #132, #133, #134 — three tightly-coupled TUI improvements for the 1.6.0 milestone. They share a custom-field-definitions resolver (and #134 a tags resolver), mirroring the #130 object-type resolver pattern, so they ship together to avoid release churn.

#133 — detail view renders list-of-object fields like the list table (bug)

The detail view stringified list values (tags, other M2M/list fields) to a raw [{'id': …, 'display': …}] repr. They now route through the shared flatten/render_cell pipeline → comma-joined display, colored when object colors are on. Both the editable and read-only branches are covered. view._cell was promoted to public render_cell.

#132 — custom-field column labels (enhancement)

Custom-field columns showed the raw custom_fields.<name> key. A new CustomFieldResolver maps the key → the field's NetBox label (GET /api/extras/custom-fields/, scoped by object type), consumed by:

• TUI list headers and the column chooser (f)
• CLI table/csv headers — for list, get, and create/update responses

The raw key stays the selector/persistence key, so --columns and saved prefs are unchanged. Labels resolve only when a custom-field column is shown; missing defs, offline, unknown fields, and label collisions all fall back to the raw key. json/jsonl/yaml are untouched.

#134 — bulk-edit polish + per-field custom fields + tags dropdown (enhancement)

• Per-field custom fields: custom_fields expands into one typed widget per field (text/number/switch/select/multiselect) in both the single EditForm and the BulkEditForm, via the shared forms.py layer. Values stage flat as custom_fields.<name> and are folded back into a nested custom_fields object before the PATCH/POST.
• Tags multi-select: tags renders as a SelectionList populated from GET /api/extras/tags/, submitting the NetBox-writable [{name, slug}] list. Single edit only stages a tags change when the selection actually differs; bulk replaces ("Set tags to…").
• Layout polish: bulk form CSS aligns the include-toggle + label + widget with the single-edit experience.
• Graceful degradation: falls back to the prior single text inputs when tag/custom-field definitions can't be fetched.

Notes

• New framework-free resolvers live in nsc/savedfilters/ alongside the feat(saved-searches): back saved searches with NetBox native SavedFilter #130 object-type resolver.
• Widget ids encode the custom_fields. dot as a hyphen (Textual rejects dots in ids).
• An adversarial multi-agent review ran against the branch; its confirmed findings (cf-multiselect pre-seeding, get/response header relabeling, FK id encoding consistency) are fixed in the final commit.
• Version bump to 1.6.0 is intentionally left for the separate release PR, per this repo's release flow.

Testing

• just lint (ruff + mypy --strict) clean.
• just test — 1324 passed, 1 skipped (19 new tests across resolvers, detail rendering, CLI/TUI headers, forms helpers, and bulk/single edit flows).

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