Same mechanical pattern as Phase 17 skin_dialog. Each dialog now
inherits the MC-matching rounded borders + drop shadow from the
shared terminal::popup::render_popup() shell:
filter_dialog, encoding_dialog, pattern_dialog, confirm_dialog,
overwrite_dialog, layout_dialog, panel_options, chattr_dialog
Changes per file:
- Remove import of Block, Borders, Clear
- Add import of centered_cols_rect, render_popup
- Replace inline geometry+Clear+Block with centered_cols_rect()
+ render_popup() call
- Title no longer needs manual styling (render_popup applies
[dialog] dtitle colors)
confirm_dialog also dropped its BorderType::Double variant (now
matches the rest of TLC's rounded look); removed its now-unused
local centered_rect helper.
Tests: 1112 passed (no regressions; same count as pre-Phase 18).
vasilito
e4987256f7