feat(java): Separate the jdtls JDK and add Settings for New Projects (#21)

- Languages & Frameworks › Java › Language Server › JDK (languages.java.jdtlsJdk) runs jdtls on its own JDK, like IDEA's JDK for importer; the project keeps compiling and running with the Project JDK.
- Toolchain pages get the Global / This project switch (default This project); Global shows and edits the global layer.
- File › New Projects Setup › Settings for New Projects… edits only the global layer, which new projects inherit.
- Configuration errors (launch_error) show as "Not started" instead of "Crashed".

Fixes #18
Fixes #19

Claude-Session: https://claude.ai/code/session_01SaPPsVPuk6ZTNsoUCNCbMv

src/features/code-insight/ServerStatus.tsx

@@ -89,6 +89,6 @@ export function ServerStatus() {
 function toneOf(status: string): "ok" | "busy" | "error" | "idle" {
   if (status === "ready") return "ok";
   if (status === "starting" || status === "busy") return "busy";
-  if (status === "crashed" || status === "missing") return "error";
+  if (status === "crashed" || status === "missing" || status === "misconfigured") return "error";
   return "idle";
 }

src/features/code-insight/servers.ts

@@ -126,12 +126,13 @@ export const STATUS_LABEL: Record<ServerStatus, string> = {
   crashed: "Crashed",
   stopped: "Stopped",
   missing: "Not installed",
+  misconfigured: "Not started",
 };
 
 /** One-line summary for the status bar. */
 export function serversSummary(servers: readonly ServerEntry[]): { text: string; tone: "ok" | "busy" | "error" | "idle" } | null {
   if (!servers.length) return null;
-  const bad = servers.filter((s) => s.status === "crashed" || s.status === "missing");
+  const bad = servers.filter((s) => s.status === "crashed" || s.status === "missing" || s.status === "misconfigured");
   const busy = servers.filter((s) => s.status === "starting" || s.status === "busy");
   const tone = bad.length ? "error" : busy.length ? "busy" : servers.some((s) => s.status === "ready") ? "ok" : "idle";
   const names = [...new Set(servers.map((s) => s.name))];

src/features/code-insight/views.test.ts

@@ -44,6 +44,7 @@ describe("serversSummary", () => {
     expect(serversSummary([s("rust-analyzer", "ready")])).toEqual({ text: "rust-analyzer", tone: "ok" });
     expect(serversSummary([s("vtsls", "ready"), s("eslint", "starting")])).toEqual({ text: "vtsls +1", tone: "busy" });
     expect(serversSummary([s("gopls", "missing")])!.tone).toBe("error");
+    expect(serversSummary([s("jdtls", "misconfigured")])!.tone).toBe("error");
   });
 });