fix(desktop): move platform creation before event listener

[jerome-benoit]

What does this PR do?

Fixes typecheck error TS2304: Cannot find name 'platform' introduced in #7360.

Moves platform and serverPassword creation outside render() so they're available to the click event listener that references platform.openLink().

Fixes #8657

How did you verify your code works?

• ✅ Typecheck passes: bun run typecheck
• ✅ Pre-push hooks pass (includes turbo typecheck)
• ✅ No functionality changes - only moves existing code to correct scope