Consolidate type colors into single source of truth — pyrite

Problem

`typeColors` are defined in three places with inconsistent values:

`$lib/constants.ts` — canonical

`EntryCard.svelte` — local copy, different values (e.g. `adr` is pink instead of purple)

`graph/+page.svelte` — another local copy

This means entries show different colors on different pages.

Solution

Delete the local copies. Import from `$lib/constants.ts` everywhere. This was already identified in the UX accessibility fixes item but hasn't been done.

Consolidate type colors into single source of truthbacklog_item

Problem

Solution

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