fix(cc-config): read .claude.json from the same root the CLI writes it to

getClaudeJsonPath() was the only one of cc-discovery's 20 read paths not
derived from getClaudeHome(), so a CLAUDE_HOME install read one file while
the CLI wrote another. The default case was fixed by dropping the
CLAUDE_CONFIG_DIR pin; this closes the mirrored half.

Also replaces the Remove button's display-string comparison with a
removable flag from the reader: rewording the source label silently
resurrected a button that always fails.

client/src/lib/api.ts

@@ -2651,6 +2651,11 @@ export interface CcMcpServer {
   name: string;
   /** Which config file this entry came from (e.g. a `.mcp.json` path). */
   source: string;
+  /**
+   * False when no `claude mcp` scope can address this entry, so the dashboard
+   * cannot remove it. Absent means removable — only the reader sets it.
+   */
+  removable?: boolean;
   /** Transport: local subprocess ("stdio"), remote HTTP, or undetermined. */
   kind: "stdio" | "http" | "unknown";
   /** Launch command, for `kind === "stdio"`. */