Increased message font to medium and enabled trackball for selecting node/channel selection.

[tomhanax]

This change covers two things:

1. Increased message font to medium on larger displays, namely T-Deck and Chatter 2.0 (based on discussions on [Board]: reconsideration of the chatter 2.0 #2896). The font will be medium for incoming message and also while composing new message using CannedMessageModule. There may be some theoretical truncation on very long messages, but in practical life this is not the issue.
2. On T-Deck, trackball can be used for selecting node/channel selection. You can use UP and DOWN direction and switching between message, node and channel. LEFT / RIGHT cycles values. The changes were minor but the effect is IMHO pretty usable, even more now when we have real private messages (using public/private keys)

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PS: This is my first PR, so sorry if something is not in order, I like to learn in time.