Draft: Resolve "Add button that marks all notifications as read"

Closes #1172

added part::frontend label

added 278 commits

• c520f821...93fff2a7 - 278 commits from branch master

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added 105 commits

• 93fff2a7...8250dac1 - 105 commits from branch master

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added 44 commits

• 8250dac1...a885741c - 44 commits from branch master

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added 1 commit

• 75d5c025 - WIP: Add button that marks all notifications as read

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