FE-788: add form row to ds

[alex-e-leon]

🌟 What is the purpose of this PR?

• Add FormRow component to ds
• Add connectToLeftInput and connectToRightInput props to BaseInput

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

• does not modify any publishable blocks or libraries, or modifications do not need publishing

📜 Does this require a change to the docs?

The changes in this PR:

• are internal and do not require a docs change

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[cursor]

PR Summary

Medium Risk
Touches shared BaseInput styling and adds new public DS APIs; visual regressions on existing TextInput/NumberInput usages are possible though behavior is additive.

Overview
Adds FormRow to lay out multiple Form.Field children in a flex row, with gap (md–xl, spaceBetween, none), align, optional row-level errors, and noWrap. Form stories cover default layouts, gap variants (including gap="none" with connected inputs), and alignment.

BaseInput / TextInput gain connectToLeftInput and connectToRightInput (default variant only) so adjacent inputs render as a segmented control via a new InputConnector SVG and wrapper padding. Styling moves backgrounds/borders to a --base-input-background-color CSS variable (neutral/red tokens instead of legacy bd-solid / status tokens) so hover, disabled, invalid, and adornment states stay in sync with connectors.

Ladle stories document FormRow and connected input matrix (states, sizes, suffix buttons).

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