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 design from the 2.0 prototype into the widget:

• Quick Settings strip on the main page (jumper-advanced only): compact, icon-less rows (title sized like the "Send"/"Receive" input-card labels) showing live values for the active sub-mode — Swap/Limit: 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 now offers Best Return / Fastest / Cheapest; slippage is a preset selector (Auto / 0.5% / 1% / 3% / Custom).
• New routeType setting (All / Simulated only / Private).

Built on top of feat/private-tab-mode, so this PR targets that branch.

⚠️ Open items before merge (flagged in review)

• routeType is display-only — the SDK has no route-type/privacy param, so Simulated/Private currently don't affect routing (TODO in types.ts). Consider gating those options 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]

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Latest commit: 2e18856

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