fix(radar): inject correct build version via ldflags

Version was showing as "dev" instead of "v1.5.14" because ldflags
targeted the wrong variable. Changed from internal/version.Current
to main.version which is the variable actually used by cmd/explorer.

packages/radar/package.nix

@@ -6,13 +6,13 @@
 }:
 
 let
-  version = "1.5.10";
+  version = "1.5.14";
 
   src = fetchFromGitHub {
     owner = "skyhook-io";
     repo = "radar";
     rev = "v${version}";
-    hash = "sha256-Xvn1dDqCaBlXY/XD2GoWBDECMhxFlYCGlnVinLR/c1A=";
+    hash = "sha256-/TebJGe672kefEci2WuDWw31ivGiMImxQCcWIzJ8pQE=";
   };
 
   # Build the frontend as a separate derivation.
@@ -75,7 +75,7 @@ buildGoModule {
   pname = "radar";
   inherit version src;
 
-  vendorHash = "sha256-bmS4nRzVG4ZmpV3kq2Ih8uerRWL5weq0KP54jT3sh5I=";
+  vendorHash = "sha256-86+KD+MTiBh+Nw64suCWCkv90/+FXUKWiv1CS2EWTpw=";
 
   # Copy pre-built frontend assets before Go compilation for go:embed
   preBuild = ''
@@ -85,6 +85,12 @@ buildGoModule {
 
   env.CGO_ENABLED = 0;
 
+  ldflags = [
+    "-s"
+    "-w"
+    "-X main.version=v${version}"
+  ];
+
   subPackages = [ "cmd/explorer" ];
 
   doCheck = false;