fix(session): bind new sessions to selected project (#1708)

* fix(session): bind new sessions to selected project

Fix #1521: openNewSessionDraft() always used currentDirectory even when
the user selected a different project. Now prefers the selected project's
path when no explicit directory is provided.

* test(session): add unit test for openNewSessionDraft project binding

---------

Co-authored-by: Leonid Skorobogatyy <bash@opencode.itc.local>
Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/ui/src/sync/session-ui-store.ts

@@ -626,6 +626,7 @@ export const useSessionUIStore = create<SessionUIState>()((set, get) => ({
       if (explicitProject || explicitDirectory !== null) {
         return explicitProject ?? inferredProjectFromDir ?? fallbackProject
       }
+      if (activeProject) return activeProject
       if (currentDirectory) return currentDirProject ?? fallbackProject
       return persistedProjectByDir ?? persistedProjectById ?? fallbackProject
     })()
@@ -633,6 +634,8 @@ export const useSessionUIStore = create<SessionUIState>()((set, get) => ({
     const directory = (() => {
       if (explicitDirectory !== null) return explicitDirectory
       if (explicitProject) return normalizePath(explicitProject.path ?? null)
+      const selectedProjectPath = normalizePath(selectedProject?.path ?? null)
+      if (selectedProjectPath && selectedProjectPath !== currentDirectory) return selectedProjectPath
       if (currentDirectory) return currentDirectory
       if (persistedTarget?.directory) return persistedTarget.directory
       return normalizePath(selectedProject?.path ?? null)