feat(widget): surface route settings on main page with dedicated pages

[effie-ms]

Which Linear task is linked to this PR?

N/A

Why was it implemented this way?

Brings the advanced-mode settings design from the 2.0 prototype into the widget:

• Quick Settings strip on the main page, shown only for the advanced split tabs (swap-advanced / bridge-advanced): compact rows (title sized like the "Send"/"Receive" input-card labels) showing live values for the active sub-mode — Swap: Route type · Exchanges · Max slippage; Bridge: Route priority · Exchanges · Bridges · Max slippage. Each row navigates to its setting.
• Dedicated settings sub-pages for Route type, Route priority, and Slippage (previously inline accordion cards), matching the prototype. Bridges/Exchanges already had their own pages. Route priority offers Best Return / Fastest / Cheapest; slippage is a preset selector (Auto / 0.5% / 1% / 3% / Custom).
• New routeType setting (All / Private).

Gating is purely tab-key driven (advancedNavigationTabKeys) on the navigation-tabs infrastructure already merged to main, so this PR targets main and has no dependency on other feature branches.

⚠️ Open items before merge

• routeType is display-only — the SDK has no route-type/privacy param, so it currently does not affect routing (TODO in types.ts). Consider gating the option until wired.
• "Best Return" maps to the deprecated RECOMMENDED order; needs a live-API smoke test.
• New i18n keys are English-only so far.
• No changeset yet.

Visual showcase (Screenshots or Videos)

N/A

Checklist before requesting a review

• I have performed a self-review and testing of my code.
• This pull request is focused and addresses a single problem.
• If this PR modifies the Widget API or adds new features that require documentation, I have updated the documentation in the public-docs repository.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 8309cc6

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✅ E2E Dev Smoke — passing

Check	Result
Dev server start (pnpm dev)	✅ started
Smoke tests	✅ passed

4 passed · 0 failed · 0 skipped · 13s

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E2E Playground results

 158 passed

Details

 158 tests across 10 suites
 2 minutes, 13 seconds
 8309cc6

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E2E Examples — all passed

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