Allow to use ANSI 4 bit colors (#6321)

Here some changes which I made when works on #5342 , I think we may say
that it actually fixes #5342 because after that we have full colors in
docs and code which allows user to do colours as he would like to.

beets/ui/__init__.py

@@ -472,13 +472,13 @@ CODE_BY_COLOR = {
     "normal": 0,
     "bold": 1,
     "faint": 2,
-    # "italic":       3,
+    "italic": 3,
     "underline": 4,
-    # "blink_slow":   5,
-    # "blink_rapid":  6,
+    "blink_slow": 5,
+    "blink_rapid": 6,
     "inverse": 7,
-    # "conceal":      8,
-    # "crossed_out":  9
+    "conceal": 8,
+    "crossed_out": 9,
     # Text colors.
     "black": 30,
     "red": 31,
@@ -488,6 +488,14 @@ CODE_BY_COLOR = {
     "magenta": 35,
     "cyan": 36,
     "white": 37,
+    "bright_black": 90,
+    "bright_red": 91,
+    "bright_green": 92,
+    "bright_yellow": 93,
+    "bright_blue": 94,
+    "bright_magenta": 95,
+    "bright_cyan": 96,
+    "bright_white": 97,
     # Background colors.
     "bg_black": 40,
     "bg_red": 41,
@@ -497,6 +505,14 @@ CODE_BY_COLOR = {
     "bg_magenta": 45,
     "bg_cyan": 46,
     "bg_white": 47,
+    "bg_bright_black": 100,
+    "bg_bright_red": 101,
+    "bg_bright_green": 102,
+    "bg_bright_yellow": 103,
+    "bg_bright_blue": 104,
+    "bg_bright_magenta": 105,
+    "bg_bright_cyan": 106,
+    "bg_bright_white": 107,
 }
 RESET_COLOR = f"{COLOR_ESCAPE}[39;49;00m"
 # Precompile common ANSI-escape regex patterns

docs/changelog.rst

@@ -145,6 +145,7 @@ Other changes:
   unavailable, enabling ``importorskip`` usage in pytest setup.
 - Finally removed gmusic plugin and all related code/docs as the Google Play
   Music service was shut down in 2020.
+- Updated color documentation with ``bright_*`` and ``bg_bright_*`` entries.
 
 2.5.1 (October 14, 2025)
 ------------------------

docs/reference/config.rst

@@ -467,14 +467,20 @@ Available attributes:
 
 Foreground colors
     ``black``, ``red``, ``green``, ``yellow``, ``blue``, ``magenta``, ``cyan``,
-    ``white``
+    ``white``, ``bright_black``, ``bright_red``, ``bright_green``,
+    ``bright_yellow``, ``bright_blue``, ``bright_magenta``, ``bright_cyan``,
+    ``bright_white``
 
 Background colors
     ``bg_black``, ``bg_red``, ``bg_green``, ``bg_yellow``, ``bg_blue``,
-    ``bg_magenta``, ``bg_cyan``, ``bg_white``
+    ``bg_magenta``, ``bg_cyan``, ``bg_white``, ``bg_bright_black``,
+    ``bg_bright_red``, ``bg_bright_green``, ``bg_bright_yellow``,
+    ``bg_bright_blue``, ``bg_bright_magenta``, ``bg_bright_cyan``,
+    ``bg_bright_white``
 
 Text styles
-    ``normal``, ``bold``, ``faint``, ``underline``, ``reverse``
+    ``normal``, ``bold``, ``faint``, ``italic``, ``underline``, ``blink_slow``,
+    ``blink_rapid``, ``inverse``, ``conceal``, ``crossed_out``
 
 terminal_width
 ~~~~~~~~~~~~~~