fix: make web static title stage-neutral

[sabraman]

Summary

• change the static web HTML title from T3 Code (Alpha) to T3 Code

Why

The runtime app title is stage-dependent in branding.ts and gets set by main.tsx, but index.html hardcoded the Alpha label. That made the initial tab title wrong in development before the app bootstrapped and corrected it.

Verification

• bun fmt
• bun lint
• bun typecheck

Note

Remove '(Alpha)' stage label from web page title

• Updates the static title in index.html from T3 Code (Alpha) to T3 Code.
• Adds noopener to the rel attribute on external links in ChatMarkdown.tsx, changing it from noreferrer to noopener noreferrer.

^{Macroscope summarized 67b7313.}

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[sabraman]

Closing this duplicate PR.