feat: redesign and bump to v2

[andrepg]

This update improves a lot of things in our app. From a new layout to projects management.

The complete list of features can be found in our git log. But here we have a summarized version:

Developer experience

• new flatpak manifests to build and development, separating app instances
• new Typescript codebase, to improve our workflow and write better code
• with new Typescript codebase, more clean and commented Meson build system
• centralized a lot of translation, icons, signals and other static things
• included a few unit tests to ensure our core is locked

User experience

• New layout with collapsable sidebar and adaptive design
• Project automagic categorization, with a sidebar dynamic menu
• Assign a project with @ symbol from the new task field
• A new form to edit tasks, projects and mark as done or deleted
• Deleted tasks are now persisted until purge
• New ordering system, with a popover to manage the current state