lunarmodules / terminal.lua / 23298583630

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fix(progress): use display-column width in ticker for UTF-8 correctness

The ticker function used utf8.len (character count) and utf8sub
(character-based slicing) to compute frame widths and extract frames.
This produced incorrect frame sizes for double-width characters (CJK,
emoji) where 1 character occupies 2 display columns.

Replace with utf8swidth (display-column count) and utf8sub_col
(column-based slicing) so each ticker frame is exactly `width`
display columns regardless of character width. Remove unused utf8
import.

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