tw4: cleanup/improve error messaging

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[Copilot]

Pull Request Overview

This PR refines error messaging and cleans up outdated TODO comments related to error handling and UI behavior.

• Update error messages in CLI preflight checks.
• Remove outdated or confusing TODO comments in pagination and charts components.
• Enhance test expectations to match the updated error outputs.

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
v4/src/lib/registry/ui/pagination/pagination-next-button.svelte	Removed outdated TODO comment referencing complex union types.
v4/src/lib/registry/ui/pagination/pagination-link.svelte	Removed outdated TODO comment referencing complex union types.
v4/src/lib/registry/charts/chart-radar-lines-only.svelte	Removed a TODO comment prompting for a hexagon drawing feature.
v4/src/lib/registry/charts/chart-line-dots.svelte	Removed a TODO comment regarding active dot styling.
v4/src/lib/registry/charts/chart-bar-negative.svelte	Removed a TODO comment regarding month labels and custom colors on bars.
packages/cli/test/utils/preflight-init.test.ts	Updated test expectations to reflect new error messages with highlighted text and links.
packages/cli/src/commands/init/preflight.ts	Improved error message consistency and detail in CLI preflight checks.

Comments suppressed due to low confidence (1)

packages/cli/test/utils/preflight-init.test.ts:47

• The error message contains a double period ('supported..'). Consider using a single period for clarity.

`Initializing a project with Tailwind v3 and Svelte v4 is not supported..\n\n` +