Polish the status card, file tab and probing tab

[zeevy]

What changed

Status card

• Axis rows read X Axis, Y Axis, Z Axis. The axis column is only as wide as its text, so the two number columns get the rest of the width.
• Buffer counts show as plain numbers, for example 0 | 0.
• WPos values are teal to show they can be tapped to edit. MPos stays dark.

File tab

• The file row reads "Select G-code file" until a file is picked.
• One extension list in Constants drives both the check and the message, so the two cannot drift. A rejected file shows the full allowed list.
• The type check runs before the copy, so a rejected file no longer also shows a "File not found" toast.

Probing tab

• Heading is "Probing" with the info icon.
• The info dialog explains the three buttons and gives four short steps.
• Editable values are teal, read only values are dark, no edit icons.

All new and changed strings have Russian and Portuguese translations.

Testing

Tested on the API 36 emulator. Picking a .pdf shows the unsupported type toast once and is rejected. Picking a .gcode file loads it and shows 0% (0/5) progress. Android Lint passes locally.