fix: group mobile trade tabs to prevent overflow in translated locales

[premiumjibles]

Description

The mobile trade page header showed all 5 tab options (Swap, Limit, Buy, Sell, Earn) as individual pill buttons in a single horizontal row. In languages with longer labels (German, French, etc.), these overflowed off both edges of the screen.

This adopts the same grouping strategy already used on desktop: 3 pills (Swap, Buy/Sell, Earn) with dropdown toggles for sub-options (Market/Limit, Buy/Sell).

Issue (if applicable)

closes #SS-5535

Risk

Low risk — UI-only change scoped to mobile viewport. No new state, callbacks, or business logic introduced. Reuses existing toggle handlers and labels already defined in the component.

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

None. This is a pure UI layout change.

Testing

Engineering

1. Open the app in a mobile viewport (< 768px)
2. Confirm only 3 pill buttons are visible: Swap, Buy/Sell, Earn
3. When Swap pill is active, a Market/Limit toggle should appear below (if LimitOrders feature flag is on)
4. When Buy/Sell pill is active, a Buy/Sell toggle should appear below
5. Toggle buttons should switch sub-modes correctly
6. Test with German/French locale to confirm no overflow
7. Verify desktop layout is unchanged
8. Make sure additional toggle doesn't break the UI vertically on mobile (things on the bottom of the screen don't get pushed down and become inaccessible)

Operations

• Test on mobile viewport that tabs don't overflow in any language
• Verify toggle dropdowns switch between Market/Limit and Buy/Sell correctly

Screenshots (if applicable)

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-5535-mobile-trade-toggle

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[0xApotheosis]

Much better, gm