fix(mcp): eager-auth flag on the Grok connector links so Grok starts OAuth (#2167)

* fix(mcp): eager-auth flag on the Grok connector links so Grok starts OAuth

Live test after #2158: pasting the Grok URL into grok.com's custom
connector dialog listed all 150+ tools and never opened the sign-in. Grok
probes the URL without credentials, like claude.ai, and reads the lazy
200 on initialize as an authless server; only the 401 challenge starts
OAuth (#2159 fixed the same thing for the claude.ai link).

- lib/onboarding/checklist.ts: mcpServerUrl() builds the server URL with
  an optional eagerAuth flag; sideDoorServerUrl() gives the Grok side door
  auth=required and keeps ChatGPT lazy; claudeConnectorLink() reuses it.
  SIDE_DOORS / SideDoor move here from the component. Tests for all three.
- NewUserChecklist copies the door-specific URL (now with a client marker).
- ApiKeysPanel's Grok row copies the flagged URL, mirroring the Claude one.
- auth-mode.ts comment records the second consumer; registry entry's Grok
  step carries the flag; DECISIONS.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LhTJcwgzmN3TsLR8tVHwdi
Signed-off-by: Emil <emilmattsson14@gmail.com>

* docs(mcp): registry Claude.ai step carries auth=required too

Review pass on #2167: the registry entry flagged the Grok install URL
but left the Claude.ai step on the bare URL, which pre-fills "None" in
claude.ai's dialog (#2159). Same file, same flag, now consistent.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LhTJcwgzmN3TsLR8tVHwdi
Signed-off-by: Emil <emilmattsson14@gmail.com>

---------

Signed-off-by: Emil <emilmattsson14@gmail.com>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

components/settings/ApiKeysPanel.tsx

@@ -320,6 +320,9 @@ export function ApiKeysPanel() {
   // (extensions/general/mcp-server/auth-mode.ts). Claude Code, Cursor and the
   // stdio bridge keep the lazy URL.
   const claudeConnectorUrl = `${mcpUrl('claude-connector')}&auth=required`
+  // Grok's custom-connector dialog does the same probe: on the lazy URL it
+  // lists every tool and never opens the sign-in (observed 2026-09-02).
+  const grokConnectorUrl = `${mcpUrl('grok')}&auth=required`
 
   // claude.ai install link: opens Add-custom-connector with name and URL
   // prefilled. It only prefills the dialog, so the user still reviews and
@@ -436,7 +439,7 @@ export function ApiKeysPanel() {
                   path: (chunks) => <strong>{chunks}</strong>,
                 })}
               </p>
-              <CopyBlock text={mcpUrl('grok')} copyAriaLabel={t('copy_aria')} />
+              <CopyBlock text={grokConnectorUrl} copyAriaLabel={t('copy_aria')} />
             </div>
 
             <div>