Cover style "halves": left and right half blocks only

Twice the horizontal detail of "cells", for terminals such as macOS
Terminal whose upper and lower half blocks do not meet at the middle of
the cell.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019reK4DUGYqDUjniWYJvwUW

README.md

@@ -19,8 +19,9 @@ A terminal UI to search for movies and series with [Radarr](https://radarr.video
   plain cells in macOS Terminal, sextants on terminals known to have the glyphs or when fontconfig
   finds an installed font with them (not over SSH), else quadrants), `kitty` (force real images),
   `sextant` (2x3 pixels per cell, needs a font with the Symbols for Legacy Computing block) or
-  `quadrant` (2x2, every font has them) or `cells` (one colored cell per pixel, no glyphs; for
-  terminals whose block characters come out uneven, like macOS Terminal). Inside tmux or screen the
+  `quadrant` (2x2, every font has them), `halves` (2x1, only the left and right half blocks) or
+  `cells` (one colored cell per pixel, no glyphs); the last two are for terminals whose block
+  characters come out uneven, like macOS Terminal. Inside tmux or screen the
   block styles are used. If a poster looks wrong, set `quadrant`, or `cells` if the rows look shifted.
 - **Calendar**: the next two weeks of movie releases (cinemas, digital, physical) and airing episodes
   in one list grouped by day, with poster and plot. Move by weeks, include unmonitored items, search