feat: Conjugate app download data UI (SwiftUI)

[prince-0408]

Summary

Closes #612

Changes

File	Status	Description
DownloadDataScreen.swift	New	SwiftUI download data screen for the Conjugate app
ConjugateTab.swift	Modified	Wires the "Verb data" card tap to navigate to the download screen
Localizable.xcstrings	Modified	Adds i18n.conjugate.download.already_up_to_date string key
project.pbxproj	Modified	Registers DownloadDataScreen.swift in the Conjugate target

DownloadDataScreen.swift — Detail

Feature	Detail
Update data card	Check-for-new-data spinner + regularly update toggle
Language list	All supported languages alphabetically — Deutsch, English, Español, Français, Italiano, Português, Русская, Svenska — not filtered by installed keyboards
Per-language buttons	Orange "Download data" / green "Up to date" / "Downloading" with spinner
Update all	Shortcut to trigger all downloads at once
Feedback	Toast on download action

Screenshots

Notes

• Download functionality is intentionally stubbed — to be implemented in the follow-up issue as stated in Creation of Conjugate App download data UI with Swift UI #612
• UI matches the Figma designs

[github-actions]

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[github-actions]

Maintainer Checklist

The following is a checklist for maintainers to make sure this process goes as well as possible. Feel free to address the points below yourself in further commits if you realize that actions are needed :)

• Tests for changes have been written and the CI unit test, linting and formatting workflows within the PR checks do not indicate new errors in the files changed

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