Moved import/export event types and schemas to common

[fredrikekelund]

Related issues

• Related to STU-1540

How AI was used in this PR

For creating the type definitions that mapped import/export events to payload types, for the ImportExportEventEmitter implementation (including refactoring the classes that extend it), and for refactoring import-manager.ts and export-manager.ts to return event emitters instead of taking an event handler function as an argument.

Proposed Changes

This is the first step towards refactoring Studio to depend on the CLI for import/export.

This PR adds Zod schemas (and inferred types) that map import/export event names to payload definitions. These are stored in tools/common so they're accessible to both the CLI and Studio.

I'll be using these schemas to parse import/export events received in Studio over IPC from the CLI.

Testing Instructions

1. npm run cli:build
2. node apps/cli/dist/cli/main.mjs export --path PATH_TO_SITE and ensure the command completes successfully
3. node apps/cli/dist/cli/main.mjs import --path PATH_TO_SITE IMPORT_FILE and ensure the command completes successfully

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[wpmobilebot]

📊 Performance Test Results

Comparing 8d11952 vs trunk

app-size

Metric	trunk	8d11952	Diff	Change
App Size (Mac)	1282.23 MB	1282.24 MB	+0.01 MB	⚪ 0.0%

site-editor

Metric	trunk	8d11952	Diff	Change
load	1889 ms	1894 ms	+5 ms	⚪ 0.0%

site-startup

Metric	trunk	8d11952	Diff	Change
siteCreation	8121 ms	8139 ms	+18 ms	⚪ 0.0%
siteStartup	4933 ms	4946 ms	+13 ms	⚪ 0.0%

---

Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)

[gcsecsey]

Thanks for working on this @fredrikekelund! The refactor looks good to me overall, I added a non-blocking comment.

When testing import and export, everything still works as before. 👍

Export	Import

[gcsecsey]

Claude pointed out that progress wasn't optional in the old interface, and all call sites still provide it. We could use z.number() here.