Fix UI and navigation for download data banner

[prince-0408]

Description

This PR addresses issue #650 by implementing the following improvements to the download data UI on the keyboard:

• Navigation Update: Re-routed the "Please download language data" banner so that it directs the user to the Data Download page instead of the Installation page.
• Hardcoded Strings: Added the unlocalized "Please download language data" string directly into the InterfaceVariables.kt for all 8 supported languages. This maps it locally within the keyboard without using Scribe-i18n.
• UI Enhancements:
  • Designed and imported a new ic_arrow_circle_down_24 Material icon to match the UI mockups.
  • Packaged the text and icon tightly together and centered them perfectly by wrapping the button contents in a FrameLayout.
  • Adjusted the layout padding/height to match design spacing.
  • Refined the banner background and outline for consistency with the design mockups across both Light and Dark modes. The Dark mode now correctly features a dark background with a 1.5dp orange outline and orange text/icon.

Related Issue

Fixes #650

Changes Made

• app/src/main/res/layout/input_method_view.xml: Wrapped the empty state banner in a FrameLayout and reduced icon padding.
• app/src/keyboards/java/be/scri/services/GeneralKeyboardIME.kt: Upgraded the banner color assignments to render proper Dark mode aesthetics, added click event intent extra ("navigate_to").
• app/src/keyboards/java/be/scri/activities/MainActivity.kt: Set up a LaunchedEffect listener that detects the intent extra and navigates to the "download_data" route.
• app/src/main/res/drawable/ic_arrow_circle_down_24.xml: Created the missing UI icon.
• app/src/keyboards/java/be/scri/helpers/KeyboardLanguageMappingConstants.kt & .../*InterfaceVariables.kt: Hardcoded DOWNLOAD_DATA_LBL.

Screenshots

Light Mode	Dark Mode

[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 unit test, linting and formatting workflows within the PR checks do not indicate new errors in the files changed

  • Tests may need to be reran as they're at times not deterministic

• The CHANGELOG has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)

[andrewtavis]

praise: All's looking and working great here, @prince-0408! Thanks so much for the great work in finalizing this 😊

[andrewtavis]

Merging now and if the instrumentation tests are an issue we can get to them in #652 :)