fix: add address book quick-fill for recipient field

[Democodes-flash]

Overview

This PR adds an address book quick-fill picker to the create-stream recipient field. Users can click a contacts icon, choose a saved Stellar address, and the field is filled instantly with the alias shown alongside — saving time and eliminating manual entry errors.

Related Issue

Closes #

Changes

📇 Address Book Quick-Fill Picker

• [MODIFY] src/lib/addressBook.ts

  • Adds contact lookup helpers to source entries for the picker.
  • Sorts contacts by alias and provides a stable selection model.

• [MODIFY] components/RecipientAutocomplete.tsx

  • Adds a contacts icon inside the recipient field.
  • Opens a picker dropdown listing saved contacts with aliases.
  • Renders an empty state when the address book has no entries.

• [MODIFY] components/StreamCreationForm.tsx

  • Wires contact selection into the existing recipient field state.
  • Displays the selected contact's alias alongside the filled address.

• [MODIFY] components/ui/Input.tsx

  • Adds an optional right-side icon slot so the contacts button can live inside the input.

• [MODIFY] src/lib/i18n.ts

  • Adds localized strings for the picker title, empty state, and alias label.

Verification Results

npm run lint && npm run build
✅ 0 errors / 0 warnings

Live acceptance check:
✅ Contacts icon on recipient field opens the address book picker
✅ Selecting a contact fills the recipient field with their address
✅ Alias displayed alongside the address after selection
✅ Empty state shown when the address book has no entries

Acceptance Criteria	Status
Contacts icon on the recipient field opens the address book picker	✅ Icon rendered inside recipient field; picker dropdown opens on click
Selecting a contact fills the recipient field with their address	✅ Selected address copied into recipient field and picker closes
Alias displayed alongside the address after selection	✅ Alias shown as secondary text next to the address
Empty state shown when the address book has no entries	✅ Friendly empty state with a call-to-action to add contacts

Closes #361

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