feat(settings): add desktop Timeout and cancel card

[dschom]

Because

• We are updating pairing flows and want to land UI components / pages first.
• Adds the desktop screen shown when pairing times out or is canceled.

This pull request

• Adds packages/fxa-settings/src/pages/Pair2/Authority/TimeoutAndCancel/index.tsx, a single presentational card that covers both states via a reason: 'timeout' | 'canceled' prop.
• Adds storybook stories, one per state.
• Adds l10n files, with separate messages per state.
• Adds unit tests covering both states, including the differing secondary action.

Issue that this pull request solves

Closes: FXA-14241

Checklist

Put an x in the boxes that apply

• My commit is GPG signed.
• If applicable, I have modified or added tests which pass locally.
• I have added necessary documentation (if appropriate).
• I have verified that my changes render correctly in RTL (if appropriate).
• I have manually reviewed all AI generated code.

How to review (Optional)

Check out the storybook output here. Compare against figma designs (linked in ticket). Check out code for AI slop and over all adherence to patterns set forth in FxA.

This one card covers both interrupted states. The copy and both actions differ per state, so the interesting bit is the reason prop and the variantContent table it indexes: timeout pairs "Try again" with "Cancel", canceled pairs it with "Sync settings". onCancel and onSyncSettings are separate named props rather than one onSecondary, so the call site says what it is wiring up; the component picks between them from the same table that holds the copy.

Note, that this is just UI work, wiring up functionality comes later.

Screenshots (Optional)

See story books.

Other information (Optional)

Based on #20979, which adds the illustration. Follows the pattern set in #20952 (FXA-14234).