Facelift: hover/active colors and section spacing

[shawnborton]

Explanation of Change

Facelift pass on hover/active/selected states and content-card spacing:

• MenuItem: hover background now uses highlightBG (product200) and selected/active uses hoverComponentBG (product300). Added an opt-in hoverBackgroundColor prop plus a MenuItemHoverBackgroundContext so MenuItems rendered inside a container card (Section) hover at product300 to stand out from the product200 card background.
• LHN (Inbox): OptionRowLHN hover → product200, selected → product300 (scoped, does not affect shared selection-list/member-table styles).
• Spend LHN: SearchTypeMenuItem hover → product200, selected → product300.
• Tabs: TabSelector active tab background → product300 (hoverComponentBG); inactive/hover unchanged.
• Home widgets: MenuItems inside home widgets keep product300 hover via the explicit prop.
• Section spacing: sectionMargin 16 → 20 (card horizontal padding) and workspaceSectionMaxWidth 680 → 740; wrapper maxWidth recomputes to 780.

Note: this branch also carries earlier content-centering work (workspaceSectionCentered, centeredContentWidthLimiter) across Account / Workspace / Domain pages.

Fixed Issues

$
PROPOSAL:

Tests

1. Open the Inbox LHN, Spend LHN, and any tab bar (Inbox header tabs, Workspaces, Create Expense flow): hover a row/tab and verify the hover background is product200; verify the active/selected row/tab is product300.
2. Open Account > Profile and Workspace > Overview: hover a MenuItem row inside a card and verify the hover background (product300) stands out from the card background.
3. Verify content cards on those pages have 20px horizontal padding and a 740px content max width.
4. Verify that no errors appear in the JS console

Offline tests

Styling-only change; no offline-specific behavior.

QA Steps

Same as tests.

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[melvin-bot]

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