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/pages/CcConfig.tsx

@@ -2022,10 +2022,11 @@ function McpCard({
 }) {
   const [confirmRemove, setConfirmRemove] = useState(false);
   const busyId = `${scope}:${server.name}`;
-  // Entries from ~/.claude/settings.json have no CLI scope that addresses
-  // them (`claude mcp remove` only ever touches ~/.claude.json / .mcp.json)
-  // — a Remove button here would look live and never work.
-  const removable = server.source !== "~/.claude/settings.json";
+  // The reader decides this: entries from ~/.claude/settings.json have no CLI
+  // scope that addresses them, so a Remove button would look live and never
+  // work. Reading it off a flag rather than matching `source` keeps a reworded
+  // display string from silently bringing that button back.
+  const removable = server.removable !== false;
   return (
     <div className="rounded-lg border border-border bg-surface-2 px-4 py-3">
       <div className="flex items-center gap-2 flex-wrap">