fix: magic links missing root prefix

[kyjus25]

What does this PR do?

Closes #128

Magic link (and various other auth touchpoints) were missing the /_emdash/ prefix

Type of change

• Bug fix
• Feature (requires approved Discussion)
• Refactor (no behavior change)
• Documentation
• Performance improvement
• Tests
• Chore (dependencies, CI, tooling)

Checklist

• I have read CONTRIBUTING.md
• pnpm typecheck passes
• pnpm --silent lint:json | jq '.diagnostics | length' returns 0
• pnpm test passes (or targeted tests for my change)
• pnpm format has been run
• I have added/updated tests for my changes (if applicable)
• New features link to an approved Discussion: https://github.com/emdash-cms/emdash/discussions/...

AI-generated code disclosure

• This PR includes AI-generated code

Screenshots / test output

➜  emdash git:(bug/magic-links) pnpm exec vitest run packages/core/tests/unit/auth/invite.test.ts packages/core/tests/unit/auth/signup.test.ts packages/core/tests/unit/auth/magic-link.test.ts


 RUN  v4.1.2 /Users/kyjus25/Documents/testing/emdash

 ✓ packages/core/tests/unit/auth/magic-link.test.ts (1 test) 22ms
 ✓ packages/core/tests/unit/auth/invite.test.ts (16 tests) 138ms
 ✓ packages/core/tests/unit/auth/signup.test.ts (21 tests) 880ms

 Test Files  3 passed (3)
      Tests  38 passed (38)
   Start at  15:17:41
   Duration  1.31s (transform 405ms, setup 0ms, import 1.09s, tests 1.04s, environment 0ms)

[changeset-bot]

🦋 Changeset detected

Latest commit: a10b7d6

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 10 packages

Name	Type
@emdash-cms/auth	Patch
emdash	Patch
@emdash-cms/cloudflare	Patch
@emdash-cms/plugin-ai-moderation	Patch
@emdash-cms/plugin-atproto	Patch
@emdash-cms/plugin-audit-log	Patch
@emdash-cms/plugin-color	Patch
@emdash-cms/plugin-embeds	Patch
@emdash-cms/plugin-forms	Patch
@emdash-cms/plugin-webhook-notifier	Patch

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[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[kyjus25]

I have read the CLA Document and I hereby sign the CLA

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commit: a10b7d6