rainbow-dark: less white in message bodies; irssi: /wN window aliases

rainbow-dark.theme:
- Message body text now tinted dim grey (%w) instead of inheriting
  terminal-default (usually stark white) — done via a trailing %w in
  the msgnick template.
- Own nick in public, private, and DCC contexts switches from bold
  white (%W) to bold bright magenta (%M) so 'you' stays distinct but
  stops looking like every other bright-white element.
- Action bodies (public, private, DCC) get the same %w dim-grey tint.

.irssi/config: add W1..W99 aliases so /w1, /w2, ... /w99 jump
directly to that window (pair to the existing bare numeric /1 /2
aliases, for users whose muscle memory has 'w' in it).

.irssi/rainbow-dark.theme

@@ -77,11 +77,13 @@ abstracts = {
   ##
 
   # Angle brackets around nicks stay dark grey so the nick color is the star.
-  msgnick = "%K<%n$0$1-%K>%n %|";
+  # Trailing %w tints the message body dim grey so it doesn't compete with
+  # the rainbow accents.
+  msgnick = "%K<%n$0$1-%K>%n %|%w";
 
   # Messages from you.
   ownmsgnick = "{msgnick $0 $1-}";
-  ownnick    = "%_%W$*%n%_";
+  ownnick    = "%_%M$*%n%_";
 
   # Normal public messages — nick gets a bright cyan.
   pubmsgnick = "{msgnick $0 $1-}";
@@ -103,21 +105,22 @@ abstracts = {
 
   # Private message in a query window.
   ownprivmsgnick = "{msgnick  $*}";
-  ownprivnick    = "%_%W$*%n%_";
+  ownprivnick    = "%_%M$*%n%_";
   privmsgnick    = "{msgnick  %_%M$*%n%_}";
 
   ##
   ## Actions (/me)
   ##
 
-  # Bright yellow asterisks so actions are unmistakable.
-  action_core  = "%_%Y * %n$*%n";
+  # Bright yellow asterisks so actions are unmistakable. Action text in dim
+  # grey to match ordinary message bodies.
+  action_core  = "%_%Y * %n%w$*%n";
   action       = "{action_core $*} ";
   ownaction    = "{action $*}";
   ownaction_target = "{action_core $0}%K:%M$1%n ";
 
   # Private actions get a parenthesized asterisk; keep it in bright yellow.
-  pvtaction       = "%_%Y (*) %n$*%n ";
+  pvtaction       = "%_%Y (*) %n%w$*%n ";
   pvtaction_query = "{action $*}";
   pubaction       = "{action $*}";
 
@@ -166,14 +169,14 @@ abstracts = {
   # DCC chat, own msg/action
   dccownmsg         = "[%_%r$0%_%K($1-%K)%n] ";
   dccownnick        = "%_%R$*%n%_";
-  dccownquerynick   = "%_%W$*%n%_";
+  dccownquerynick   = "%_%M$*%n%_";
   dccownaction      = "{action $*}";
   dccownaction_target = "{action_core $0}%K:%M$1%n ";
 
   # DCC chat, others
   dccmsg      = "[%_%G$1-%_%K(%g$0%K)%n] ";
   dccquerynick = "%_%G$*%n%_";
-  dccaction   = "%_%Y (*dcc*) %n$*%n %|";
+  dccaction   = "%_%Y (*dcc*) %n%w$*%n %|";
 
   ##
   ## statusbar — the rainbow lives here