Use consistent letter-based file status badges in the Changes view

[sophiadeveloper]

In the Changes view, some current status symbols are not immediately clear:

• ± for Modified
• ★ for Untracked

The star is not commonly associated with an untracked file, while ± is difficult to recognize at this size.

The distinction also relies heavily on color, especially Goldenrod and LimeGreen. File statuses should remain identifiable without relying on color alone, improving accessibility for color-blind users.

A consistent letter-based mapping could be:

Status	Badge
Modified	M
Type changed	T
Added	A
Deleted	D
Renamed	R
Copied	C
Untracked	U
Conflicted	X

Existing colors could remain as a secondary indicator, while the badge itself would always identify the status.

For conflicts, the existing detailed markers such as UU, AU, UD, and AA could remain displayed separately.

The main usability issue is with Modified and Untracked files, but applying the same letter-based convention to all statuses would keep the UI consistent.

[Mingun]

Note, that at least colors should be changed, because they differ microscopically. Something more contrast should be used. According to color circle, if one color in the green part, the second should be in the blue.

Untracked files could be marked with ?.

[love-linger]

I'd like to keep using:

• + for added
• - for deleted
• ➜ for renamed
• ! for conflicted