feat: allow renaming built-in board columns (Maybe?, Not Now, Done)

[jaspermayone]

Adds triage_column_name, postponed_column_name, and closed_column_name to boards so teams can customize the three fixed column labels per board. Defaults preserve existing behavior.

[claude]

Claude Code Review

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[jaspermayone]

relates to #2907

[Copilot]

Pull request overview

Note

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This PR adds customizable display names for the built-in board columns (triage/“Maybe?”, postponed/“Not Now”, closed/“Done”) and wires those names into both public and internal board/card views.

Changes:

• Add three new boards table columns for custom column names with defaults and presence validation.
• Update board and card views to render the configurable column names instead of hard-coded strings.
• Add board edit UI to allow admins to edit those column names and permit the new params.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
db/schema.rb	Updates schema version and adds *_column_name fields to boards.
db/migrate/20260602120000_add_custom_column_names_to_boards.rb	Introduces migration adding the three new columns with defaults.
app/views/public/boards/show/_stream.html.erb	Uses board.triage_column_name in public stream column headers/attrs.
app/views/public/boards/show/_not_now.html.erb	Uses board.postponed_column_name in public postponed column header.
app/views/public/boards/show/_closed.html.erb	Uses board.closed_column_name in public closed column header.
app/views/cards/display/common/_stamp.html.erb	Uses board-specific column names in “stamp” UI for postponed/closed cards.
app/views/cards/columns/edit.html.erb	Uses configurable column names for card column action buttons.
app/views/boards/show/_stream.html.erb	Uses board.triage_column_name in internal stream column header.
app/views/boards/show/_not_now.html.erb	Uses board.postponed_column_name in internal postponed column header.
app/views/boards/show/_closed.html.erb	Uses board.closed_column_name in internal closed column header.
app/views/boards/edit/_column_names.html.erb	Adds form fields to edit the three column names.
app/views/boards/edit/_auto_close.html.erb	Updates auto-close copy to reference the postponed column name.
app/views/boards/edit.html.erb	Renders the new column names edit partial.
app/models/board.rb	Adds presence validations for new column-name fields.
app/controllers/boards_controller.rb	Permits the new column-name params.

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