Backport termux/termux-app PRs (2025-2026), add signing keystores, fix CI for self-hosted runner#1

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Commits on Mar 10, 2026

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Implement PRs from termux/termux-app and add signing keystores

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EduardoC3677
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Changed: Update all workflows runs-on from ubuntu-latest to mp4 (ubuntu-22.04 self-hosted runner)

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EduardoC3677
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Fixed: TerminalBuffer lineFillsWidth check to work correctly with trailing whitespace trimming

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EduardoC3677
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Apply multiple PRs: bump upload-artifact v7, sentence case UI text, reword fastlane description

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Copilot
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Implement PR #4813 (separate italic/bold/boldItalic font files) and fix workflow ANDROID_HOME

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EduardoC3677
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Fix typo: 'to big' -> 'too big' in TerminalRenderer comment

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EduardoC3677
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Fix: install unzip before android-actions/setup-android on self-hosted runner

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EduardoC3677
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