Add project creation wizard (step 7)

New project flow: native directory picker, project name (auto-filled
from folder name), project type selector (Auto-detect plus common
CMS/framework types), optional docroot, and a "start after creating"
checkbox. Runs ddev config with cwd = the chosen directory (streamed
through the existing commandRunner), then reuses the existing
useStartProject() mutation for the start step rather than inventing
multi-phase operation semantics — ddev config registers the project
by name, so a plain `ddev start <name>` works identically to starting
any other project afterward.

Scoped down from the original app's wizard: skipped scaffolding a
fresh CMS codebase (composer create-project / wp core download /
etc.) since each framework needs different install commands — this
covers project registration + config + start, with ddev's own
--auto/--project-type detection handling "auto-detect for existing
folders" for free (no custom detection heuristics needed).

Verified end-to-end against the real scratch environment: called the
create.configure IPC directly (the picker itself opens a native OS
dialog CDP can't drive, same constraint as import/export in step 4)
with a real target directory, confirmed the generated .ddev/config.yaml
has the correct name/type/docroot, confirmed the new project appears
in the sidebar via the existing polling within one refresh cycle, and
verified the modal's form guards (Create disabled until a directory
is chosen) and all type-selector options render correctly. Cleaned up
via `ddev delete`.

src/preload/index.ts

@@ -79,6 +79,24 @@ const api = {
       ipcRenderer.on('logs:exit', listener)
       return () => ipcRenderer.removeListener('logs:exit', listener)
     }
+  },
+  create: {
+    pickDirectory: (): Promise<string | null> => ipcRenderer.invoke('create:pickDirectory'),
+    configure: (
+      operationId: string,
+      directory: string,
+      projectName: string,
+      projectType: string,
+      docroot: string
+    ): Promise<void> =>
+      ipcRenderer.invoke(
+        'create:configure',
+        operationId,
+        directory,
+        projectName,
+        projectType,
+        docroot
+      )
   }
 }