Reusable mobile bottom-sheet template + swap modal migration

[nikfromkeplr]

Summary

Introduces a reusable mobile bottom-sheet template and migrates the swap modals onto it, replacing the fragmented per-modal presentations with one standard iOS/Android sheet.

The template lives in lib/src/core/layout/mobile/mobile_sheet.dart:

• showMobileSheet — root-navigator, edge-to-edge showModalBottomSheet wrapper (covers the floating tab bar, transparent surface, neutral scrim).
• MobileSheetScaffold — top-rounded surface with a grabber, a centered title flanked by absolute back (2nd-level views) and close buttons, keyboard avoidance, drag-to-dismiss, and a rubber-band over-pull spring.
• MobileSheetFormBody — adaptive form body: content above full-width action buttons pinned to the bottom.

Content-driven height (3 levels)

A formBody sheet sizes itself to its content, clamped between a 400px floor and the top-gap cap:

Level	Content	Height	Body
1	short	min-height floor	centered
2	medium	hugs the content	fits
3	tall	caps below the top gap	scrolls

In every level the action buttons stay pinned to the bottom. fillBody keeps a fixed-min Expanded slot for list bodies (contacts); expand fills the screen for long scroll lists (asset selector).

Migrated modals

• Swap asset selector (full-screen list + skeleton loading state)
• Slippage editor (level 1, centered)
• Recipient / refund address editor (level 2, hugs; morphs to contacts with a back chevron)
• Address-book contact picker (fills, centered empty state)

Scope / safety

• All sheet styling is mobile-only via kAppFormFactor; desktop layouts are unchanged (the shared SwapModalButtons full-width behavior is form-factor gated, desktop keeps its original pill layout).
• DRY: over-pull/slide math and the cap-height formula are shared helpers; the back/close buttons reuse a single corner-button widget; spacing/radii/typography use existing tokens.

Tests

• New test/core/layout/mobile/mobile_sheet_form_body_test.dart pins all three height levels (floor / hug / cap + scroll, actions pinned).
• New mobile-tagged sheet tests for the asset selector and slippage; updated swap modal route test (morph + back navigation).
• Verified: mobile sheet suites 19/19, desktop swap + send + address-book 227 passing, flutter analyze clean.

🤖 Generated with Claude Code

[chatgpt-codex-connector]

💡 Codex Review

vizor-wallet/ios/Runner/DatePickerHandler.swift

Lines 78 to 79 in 42f5b4b

	dismissPresentedSheet()
	pendingResult = result

Resolve the active date picker before replacing it

When pickDate is invoked while a previous calendar sheet is still being dismissed (for example a rapid double tap on the date field or an e2e cancel/reopen), dismissPresentedSheet() relies on the old sheet's viewDidDisappear to call finish(nil), but this line immediately overwrites pendingResult with the new call's result. The old dismissal then completes the new Dart future with null, leaves the original future unresolved, and the newly presented sheet can no longer return the selected date because pendingResult has been cleared.

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