fix(ui): anchor the host cursor to modal name inputs (#2569)

* fix(ui): anchor the host cursor to modal name inputs

IMEs draw their composition preview at the host terminal cursor. The rename
and new-worktree dialogs drew a block glyph instead of setting one, so the
frame carried no cursor and the client kept the position the focused pane
last reported. Japanese composition appeared behind the dialog and only
reached the field on Enter.

Set the cursor to the caret column instead, counting wide characters as two
cells.

refs #1755

* fix(ui): keep the clamped caret cell blank

A name that fills the field left the clamped caret sitting on the last
rendered glyph. A terminal inverts the cell under its cursor and an IME
composes there, so the glyph was hidden and composition overlapped it.

Render the text one column short of the field. The field is still cleared
in full, so the clamped caret always lands on a blank cell.

refs #1755

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Co-authored-by: kataokatsuki <kataokatsuki@users.noreply.github.com>
Co-authored-by: Can Celik <ogulcancelik@gmail.com>

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