fix(cookies): restore cookie bridge in server mode for cross-tab auth

[shaun0927]

Summary

Fixes #606 — Root Cause C: skipCookieBridge was set globally in server mode, breaking cross-tab cookie inheritance.

• Previously, --server-mode called setGlobalConfig({ skipCookieBridge: true }), which disabled cookie bridging for all page creations in the process
• This meant tab 2 could not inherit session cookies from an authenticated tab 1, even within the same session
• The skip was only ever needed for pool pre-warming (creating blank about:blank pages) to avoid CDP session conflicts — not for normal page creation

Root Cause C

CDPConnectionPool.createNewPage() already passes skipCookieBridge: true explicitly as the third argument to createPage():

const page = await this.cdpClient.createPage(undefined, undefined, true); // pool pre-warming

So the global flag in server mode was redundant for pool pre-warming and harmful for normal page creation. Removing it restores cookie bridging for user-initiated tab creation while pool pre-warming continues to skip it per-call.

Changes

• src/index.ts: Removed setGlobalConfig({ skipCookieBridge: true }) from server mode startup
• src/cdp/client.ts: Updated stale comment to reflect that the global flag is a manual override escape hatch, not set automatically by server mode

Test plan

• Build passes: npm run build
• Cookie/pool tests pass: npm test -- --testPathPattern="cookie|connection-pool"
• In server mode, authenticate in tab 1 — tab 2 should inherit those cookies on navigation
• Pool pre-warming still skips cookie bridging (no CDP session conflicts on about:blank)

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