Add a native Nodes switcher and keep the launch screen gated through session handoff

Hop-State: A_06FPGHN5480G5QDY6X262B0
Hop-Proposal: R_06FPGHM5F6DNCB08QXQS5ER
Hop-Task: T_06FPGDYGAF0D1M389636J4G
Hop-Attempt: AT_06FPGDYGAF0KT0QDZXYQS1R

src-tauri/Cargo.lock

@@ -2267,9 +2267,17 @@ checksum = "d49e936b501e5c5bf01fda3a9452ff86dc3ea98ad5f283e1455153142d97518c"
 dependencies = [
  "bitflags 2.13.1",
  "block2",
+ "libc",
  "objc2",
+ "objc2-cloud-kit",
+ "objc2-core-data",
  "objc2-core-foundation",
+ "objc2-core-graphics",
+ "objc2-core-image",
+ "objc2-core-text",
+ "objc2-core-video",
  "objc2-foundation",
+ "objc2-quartz-core",
 ]
 
 [[package]]
@@ -2289,6 +2297,7 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b402a653efbb5e82ce4df10683b6b28027616a2715e90009947d50b8dd298fa"
 dependencies = [
+ "bitflags 2.13.1",
  "objc2",
  "objc2-foundation",
 ]
@@ -2349,6 +2358,19 @@ dependencies = [
  "objc2-core-graphics",
 ]
 
+[[package]]
+name = "objc2-core-video"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d425caf1df73233f29fd8a5c3e5edbc30d2d4307870f802d18f00d83dc5141a6"
+dependencies = [
+ "bitflags 2.13.1",
+ "objc2",
+ "objc2-core-foundation",
+ "objc2-core-graphics",
+ "objc2-io-surface",
+]
+
 [[package]]
 name = "objc2-encode"
 version = "4.1.0"
@@ -3677,6 +3699,9 @@ name = "synapsis-desktop"
 version = "0.1.0"
 dependencies = [
  "http",
+ "objc2",
+ "objc2-app-kit",
+ "objc2-foundation",
  "reqwest 0.12.28",
  "serde",
  "serde_json",