fix: trade bottom nav active state for all sub-tabs

[premiumjibles]

Description

The Trade tab in the mobile bottom navigation only showed as active for the Swap (/trade) and Limit (/limit) routes. Clicking Buy, Sell, or Earn sub-tabs navigated to /ramp/trade/* and /earn/* respectively, which were missing from the relatedPaths array used by MobileNavLink for active state matching.

Changes:

• Added /ramp/trade and /earn to the Trade route's relatedPaths array in RoutesCommon.tsx
• Fixed the mobile header title to use common.trade ("Trade") instead of transactionRow.swap ("Swap") for consistency with the bottom nav label

Issue (if applicable)

closes #11964

Risk

Near zero — only affects mobile bottom nav active state styling and a translation key for the mobile page title. No transaction logic, wallet interactions, or protocol changes.

What protocols, transaction types, wallets or contract interactions might be affected by this PR?

None.

Testing

Engineering

1. Open the app on mobile (or use responsive mode in DevTools)
2. Tap the Trade bottom nav tab
3. Tap through each sub-tab: Swap, Limit, Buy, Sell, Earn
4. Verify the Trade icon in the bottom nav stays active/highlighted for all five sub-tabs
5. Verify the mobile page header says "Trade" (not "Swap")

Operations

• Open mobile app, connect wallet
• Tap Trade in bottom nav — verify it's highlighted
• Tap each sub-tab (Swap, Limit, Buy, Sell, Earn) — verify Trade stays highlighted in bottom nav for all
• Verify the page title reads "Trade" on mobile

Screenshots (if applicable)

Demo

https://jam.dev/c/76b60627-67a4-48f4-b747-edc034f88912

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/ss-5536-trade-nav-active-state

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