Add OMP as a built-in importable provider (#1388)

* Support imports from Pi-compatible providers

* Add OMP as a built-in provider

* Address Pi session scanner review

* Restore Pi session import discovery

* Update provider test for disabled OMP

packages/app/src/components/provider-icon-name.test.ts

@@ -5,6 +5,7 @@ describe("resolveProviderIconName", () => {
   it("returns the built-in identifier for known provider ids", () => {
     expect(resolveProviderIconName("kiro")).toEqual({ kind: "builtin", id: "kiro" });
     expect(resolveProviderIconName("claude")).toEqual({ kind: "builtin", id: "claude" });
+    expect(resolveProviderIconName("omp")).toEqual({ kind: "builtin", id: "omp" });
   });
 
   it("returns the catalog identifier for ACP catalog provider ids that ship an icon", () => {