feat: add semantic timeline column classes

[johnyoonh]

Summary

• Allow the reusable timeline Column component to receive class names.
• Add semantic planner-left-column and planner-right-column classes to the existing planner and time tracker timeline columns.

Test plan

• ReadLints reports no diagnostics for changed files in Cursor.
• npm run typescript could not complete in this checkout because dependencies are not installed (@tsconfig/svelte and Svelte type definitions missing).

Made with Cursor

[Copilot]

Pull request overview

This PR makes the reusable timeline Column component accept caller-provided CSS classes, then uses that capability to add semantic classes to the planner and time tracker timeline columns.

Changes:

• Add support for passing class into Column and merging it with the base "column" class.
• Add planner-left-column and planner-right-column classes to the two Column instances in timeline.svelte.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/ui/components/timeline.svelte	Adds semantic class attributes to the planner/time-tracker columns for easier targeting/styling.
src/ui/components/column.svelte	Introduces a class prop (aliased via className) and merges it into the root element’s class list.

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