fix(front): Improve autocomplete UX and placement

[timothee-LJN]

Issue

Fixes #159 and #157

Description

• Reverted to a popover to display the feature list of the autocomplete feature as it allows placing the list on top of the app.
• The combobox opens either on click or on keypress "enter" for keyboard users. I believe the UX is still performant.
• Fixes tiny layout alignments
• For now, when the user input a new value, it can be selected. All "intermediate" values are temporary saved. Eg. If I input "Balloon", "B", "Ba", "Ball"... "Balloon" will be temporary saved. It is only visible if the user erases its input. Once its closed, only the final input is saved. I decided it was ok and not to lose more time on this. I can improve that behavior if you think I should.