Validate column colors in the CLI

[robzolkos]

Validates column colors for create and update commands so invalid values are reported before the API call. Supports the app’s lowercase friendly color aliases while preserving API color values, addressing the confusion reported in #173.

Fixes #173

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Summary by cubic

Validate column colors for create/update in the CLI, mapping friendly aliases to API values and clarifying accepted values in help and errors. This blocks bad colors, aligns with the app’s lowercase names, and fixes #173.

• Bug Fixes
  • Validate and normalize --color before requests; accepts case-insensitive aliases or API values; unknown colors return an invalid-args error listing allowed options.
  • Update --color help to show lowercase aliases (blue, gray, tan, yellow, lime, aqua, violet, purple, pink) and note that API values like var(--color-card-5) are supported.

^{Written for commit ca58ef1. Summary will update on new commits.}

[Copilot]

Pull request overview

This PR adds CLI-side validation and normalization for --color on fizzy column create and fizzy column update, so invalid colors are rejected before making an API call (addressing the behavior described in #173).

Changes:

• Normalize friendly color aliases (case-insensitive) to the API’s CSS var color values before sending requests.
• Reject unknown colors early with an invalid-arguments error (no API call made).
• Expand tests to cover normalization, rejection behavior, and updated --color help text.

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Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
internal/commands/column.go	Validates/normalizes --color before create/update API calls; updates flag help text.
internal/commands/column_test.go	Updates create test expectation to match normalized API color value behavior.
internal/commands/column_color.go	Introduces alias/API-value normalization and invalid-color rejection.
internal/commands/column_color_test.go	Adds unit/integration-style tests for color normalization, rejection, and help text.

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[robzolkos]

Fixed — clarified help and error text to say supported API color values.