fix(nav): "Trade" opens the markets browser instead of one default market

[0x-SquidSol]

Problem

The header's Trade button linked to /trade — a redirect page that auto-jumps into SOL-PERP or the highest-volume market. So clicking "Trade" dropped users straight into one arbitrary market (often a brand-new, low-volume one) instead of letting them choose which to trade.

Fix

Point the "Trade" nav link at /markets (the full markets browser) so it opens the list and the user picks the market to open in the terminal.

• The button is otherwise unchanged — same label, same filled-accent styling, same position — only its destination changes.
• Applied to both the desktop CTA and the mobile menu link.
• The tab stays highlighted across the whole trade flow — active on /markets (browser) and /trade/:slab (terminal).
• aria-label updated ("Trade terminal" → "Trade — browse all markets") to match the destination.
• The /trade redirect route is left intact for direct hits and old links.

Testing

• tsc --noEmit clean.
• Verified in the browser: the "Trade" link's href is /markets; clicking it from an app page lands on /markets; /markets stays put (no redirect) and lists the markets. Screenshot below.

🤖 Generated with Claude Code

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