fix(desktop): align changelog title gutter

[ComputelessComputer]

Summary:

• Apply the collapsed sidebar header gutter to the changelog title.
• Add regression coverage for collapsed and expanded sidebar timeline states.

Test Plan:

• pnpm exec dprint fmt
• pnpm -F @hypr/desktop test src/changelog/index.test.tsx
• pnpm -F @hypr/desktop typecheck

---

Note

Low Risk
UI-only padding and config/shell reads in the changelog tab, with tests and no auth or data changes.

Overview
When sidebar timeline mode is on and the left sidebar is collapsed, the changelog tab header now gets the same pl-[156px] gutter used elsewhere (e.g. session note headers) so the “What’s new” title lines up with the timeline layout.

The gutter is only applied when timeline mode is enabled and the sidebar is collapsed; an expanded sidebar leaves the header unchanged. Vitest coverage was added for both cases.

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