feat: project settings page with paseo.json editor

Adds a Projects settings flow for inspecting and editing per-project
paseo.json (worktree setup/teardown, scripts, terminals) directly from the
app. Reads/writes go through new daemon RPCs with revision-based optimistic
concurrency, and the screen always keeps its header and host picker visible
so a hung host doesn't trap the user.

packages/app/src/utils/sidebar-shortcuts.test.ts

@@ -11,11 +11,13 @@ function workspace(input: {
   workspaceId: string;
   workspaceDirectory: string;
   name: string;
+  projectKey?: string;
 }): SidebarWorkspaceEntry {
   return {
     workspaceKey: `${input.serverId}:${input.workspaceId}`,
     serverId: input.serverId,
     workspaceId: input.workspaceId,
+    projectKey: input.projectKey ?? "project-default",
     workspaceDirectory: input.workspaceDirectory,
     projectKind: "git",
     workspaceKind: "checkout",