fix: persist create-stream form draft to sessionStorage across page reloads (Closes #1087)

[sojetunde8]

Closes #1087

Summary

• Persist multi-step wizard form state to sessionStorage on each change (debounced 500ms) to survive accidental page reloads
• Restore the saved draft on remount with a visible "resumed draft" banner and a "Discard Draft" affordance
• Clear the draft on successful on-chain submission or explicit discard; keep it across normal navigation so the user can return
• Guard recipient deep-link prefill so it doesn't overwrite a restored draft

Testing

• Added unit test suite covering: saving form data on change, restoring draft on mount, banner visibility, discard flow, draft-vs-query-param precedence, and empty-draft edge case
• Verified with existing test patterns and conventions

[ogazboiz]

nice feature and the seven tests (including draft vs query-param precedence) are solid. three fixes needed:

1. the debounced save fires 500ms after mount even on a pristine form, writing an empty draft that loadDraftFromSession happily accepts, so the next visit shows a bogus "Resumed a saved draft" banner over an empty form. skip saving when the form equals defaults, or reject empty drafts on load.
2. the banner calls loadDraftFromSession() on every render just to read savedAt. capture it once in state.
3. revert the "Back to Dashboard" Link to a Link. the button plus router.push swap does not protect the draft (Link navigation would not clear sessionStorage either) and regresses semantics.

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[sojetunde8]

Resolved, Chief. @ogazboiz