feat: centralize theme palette + add waybar bluetooth module

Theme centralization:
- theme/colors.json is now the single source of truth for the palette.
- New theme/generate-theme.py renders, at install time, the three derived
  artifacts into ~/.config: colors.css (waybar/wofi @import), mako config,
  and hyprlock-colors.conf (hyprlang $tn_* variables).
- theme/colors.css removed from the repo (now generated); install.sh calls
  the generator instead of the old inline mako snippet.
- hyprlock.conf sources the generated color file and uses $tn_* variables
  instead of hardcoded rgba() values.
- Generator covered by theme/test_generate_theme.py.

Bluetooth:
- Added waybar built-in bluetooth module (config.jsonc + style.css), with
  bluez/bluez-utils in packages.txt.

Includes design spec and implementation plan under docs/superpowers/.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

hyprlock/hyprlock.conf

@@ -1,3 +1,5 @@
+source = ~/.config/theme/hyprlock-colors.conf
+
 general {
     grace = 0
     hide_cursor = true
@@ -24,7 +26,7 @@ label {
     text = cmd[update:1000] date +"%-I:%M %p"
     font_family = JetBrains Mono Nerd Font
     font_size = 96
-    color = rgba(c5c8c6ff)
+    color = $tn_fg
     position = 0, 150
     halign = center
     valign = center
@@ -35,7 +37,7 @@ label {
     text = cmd[update:60000] date +"%A, %B %-d"
     font_family = JetBrains Mono Nerd Font
     font_size = 24
-    color = rgba(969896ff)
+    color = $tn_fg_dim
     position = 0, 40
     halign = center
     valign = center
@@ -47,11 +49,11 @@ input-field {
     outline_thickness = 2
     dots_size = 0.25
     dots_spacing = 0.4
-    inner_color = rgba(282a2eff)
-    outer_color = rgba(81a2beff)
-    font_color = rgba(c5c8c6ff)
-    fail_color = rgba(cc6666ff)
-    check_color = rgba(b5bd68ff)
+    inner_color = $tn_bg_alt
+    outer_color = $tn_blue
+    font_color = $tn_fg
+    fail_color = $tn_red
+    check_color = $tn_green
     placeholder_text = <i>Touch fingerprint or type password</i>
     fail_text = <i>$FAIL</i>
     fade_on_empty = false