## Refactor app-dev state management and build utilities
- Store only `manifest` in `AppDevState` instead of full
`ManifestBuildResult`; add `sourcePath` to `FileStatus`
- Pass `sourcePaths` directly to watchers instead of
`ManifestBuildResult`
- Only reset `fileUploadStatus` for functions/components when their
source paths change
- Add pure `updateManifestChecksum` utility that returns a new manifest
without side effects
- Extract `processEsbuildResult` to deduplicate build result processing
between watchers
- Rename `serverlessFunctions` → `functions` in SDK code (API unchanged)
- Extract `writeManifestToOutput` to shared `manifest-writer.ts`
## Summary
Adds `app:build` command as a one-shot version of `app:dev` - builds
manifest, functions, and front components once then exits (no watching).
**Changes:**
- Added `watch` option to `FunctionsWatcher` and
`FrontComponentsWatcher` to support both watch and one-shot modes
- Created `AppBuildCommand` reusing the same build logic as `app:dev`
with `watch: false`
- Added integration tests for `app:build` on both `rich-app` and
`root-app`
- Updated manifest types: `handlerPath` → `sourceHandlerPath` +
`builtHandlerPath`, `componentPath` → `sourceComponentPath` +
`builtComponentPath`
- Updated test app `package.json` scripts to match `create-twenty-app`
template
## Add `frontComponent` entity type to SDK
This PR adds a new `frontComponent` entity type at parity with
`serverlessFunction`. Front components are React components that can be
defined and bundled as part of Twenty applications.
### Changes
#### New Entity Type
- Added `FRONT_COMPONENT` to `SyncableEntity` enum
- Front components use `*.front-component.tsx` file naming convention
- CLI command `twenty app:add` now includes `front-component` as an
option
#### SDK Application Layer (`twenty-sdk`)
- Added `defineFrontComponent()` function for defining front component
configurations with validation
- Added `FrontComponentConfig` type for component configuration
- Added `getFrontComponentBaseFile()` template generator for scaffolding
new front components
- Added `loadFrontComponentModule()` to load front component modules and
extract component metadata
#### Shared Types (`twenty-shared`)
- Added `FrontComponentManifest` type with `universalIdentifier`,
`name`, `description`, `componentPath`, and `componentName` fields
- Updated `ApplicationManifest` to include optional `frontComponents`
array
#### Manifest Build System
- Updated `manifest-build.ts` to discover and load
`*.front-component.tsx` files
- Updated `manifest-validate.ts` to validate front components and check
for duplicate IDs
- Updated `manifest-display.ts` to display front component count in
build summary
- Updated `manifest-plugin.ts` to display front component entry points
and watch `.tsx` files
#### Template (`create-twenty-app`)
- New applications now include a sample
`hello-world.front-component.tsx` file
#### Tests
- Added unit tests for `defineFrontComponent()`
- Added unit tests for `getFrontComponentBaseFile()`
martmull