fix(sway): visible focus ring, floating modifier, volume binds

swayfx: with `border pixel` the visible line is child_border, not `border`
(which only paints title bars). Focused child_border was $base00 = black on
black, i.e. invisible; both are now the same gray.

keybinds: restore `floating_modifier $mod normal` (was `none`) and drop the
`pkill -RTMIN+10 i3blocks` tail from the volume binds -- i3blocks is not in
use, waybar is.

windows: drop a stray trailing semicolon; waybar: remove the unused
sway/submap module.

.config/sway/config.d/swayfx

@@ -41,6 +41,22 @@ set $base0F #666666
 
 # base00-02=bg #3E3B33, base03=olive #8C9A6B, base04=peach #F3B49F, base05=rust #D9714C, base06-07=cream #FFE8DB
 
+# ╔══════════════════════════════════════════════════════════════════╗
+# ║ FOCUS RING (subtle gray ramp)                                    ║
+# ║                                                                  ║
+# ║ With `border pixel` the line you actually see around a window is ║
+# ║ child_border (5th color). `border` (1st) only paints title bars, ║
+# ║ which pixel borders don't have -- so both are set to the same    ║
+# ║ gray here. Previously child_border for focused windows was       ║
+# ║ $base00 (#000000) = invisible on a black background, which is    ║
+# ║ why the focused window was hard to spot.                         ║
+# ║                                                                  ║
+# ║ Tune: lighter = easier to spot, darker = less obvious.           ║
+# ╚══════════════════════════════════════════════════════════════════╝
+set $border_focus    #252525
+set $border_inactive #171717
+set $border_unfocused #0D0D0D
+
 #set $base00 #000000
 #set $base01 #121212
 #set $base02 #222222
@@ -59,9 +75,9 @@ set $base0F #666666
 #set $base0F #444444
 
 # Property Name         Border  BG      Text    Indicator Child Border
-client.focused          #FFFFFF $base00 #FFFFFF #FFFFFF $base00
-client.focused_inactive $base02 $base00 $base05 $base03 $base02
-client.unfocused        $base01 $base00 $base05 $base03 $base01
+client.focused          $border_focus     $base00 $base07 $border_focus     $border_focus
+client.focused_inactive $border_inactive  $base00 $base05 $border_inactive  $border_inactive
+client.unfocused        $border_unfocused $base00 $base05 $border_unfocused $border_unfocused
 client.urgent           #FFA14C #FFA14C $base00 #FFA14C #FFA14C
 client.placeholder      $base00 $base00 $base05 $base00 $base00
 client.background       $base00