feat: add in-keyboard clipboard history manager

[Roniscend]

Contributor checklist

• This pull request is on a separate branch and not the main branch
• I have tested my code with the ./gradlew lintKotlin detekt test command as directed in the testing section of the contributing guide

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Description

Introduces a new clipboard key that opens a persistent, Room-backed history panel with copy/paste suggestions, pinning, deleting, and dark-mode support.
Fixes: #459

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[github-actions]

Thank you for the pull request! 💙🩵

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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)

[Roniscend]

@andrewtavis
I've added a new in-keyboard clipboard feature to Scribe. I'm attaching screenshots covering the different states and use cases. Could you please review the design and let me know if you have any suggestions or improvements

[andrewtavis]

Testing this with @angrezichatterbox now, @Roniscend :)

praise: Really some amazing work here! Thanks for the great work, @Roniscend! Also thanks for the efforts to review and finalize it, @angrezichatterbox! This has been a very long term goal for the project, and it's amazing to see it finalized 😊