[FEATURE] Add Per-platform Completion-Key Options

[aidanmaney]

Description of the Problem

I use Obsidian on Computer and Mobile and have been using tab-to-complete when I take notes on my Laptop but since I don't think I can tab on my phone I can use the other option of space so being able to customize the key per-platform would be helpful so I don't have to change away from tab on laptop.

Description of the Solution

Create two separate sections with the existing options*:

• Mobile Key trigger for non-auto snippets
• Mobile Key trigger for non-auto snippets

*I think if you have an iPad with keyboard you can tab so might as well keep the same options.

Additional

Alternatively: a mobile-menu-bar button to initiate completion. Above solution avoids taking up a valuable menu-bar slot and using space won't risk breaking typing-rhythm.