feat(console): terminal polish — lite/color-coded toggles, dark bg, monospace font

Work through the console items in todo.md:

- Lite filter toggles (#5): replace the single hasLogFilters() bool with a
  ConsoleLogFilterCaps struct so each backend advertises which toggles apply.
  Full node = daemon/errors/rpc-trace/app; lite = errors-only + app (its
  diagnostics ring maps to the App/Error channels; the text filter is always
  shown). Lite previously showed no toggles at all.
- Color-coded toggles (#6): each filter checkbox is tinted with its channel's
  accent color (daemon=blue, errors=red, rpc=secondary, app=teal) via a new
  channelAccentColor() that also drives the output's left accent bar — one source
  of truth for channel color.
- Darker terminal look (#7): drop the light glass rectangle on the input; both
  output and input now get a terminal-dark overlay (tabs.console.bg-darken-alpha,
  default 110) and the input field blends into it (transparent frame bg).
- Monospace font (#8): bundle Ubuntu Mono (res/fonts/UbuntuMono-R.ttf, Ubuntu
  Font License — same family as the existing Ubuntu fonts) via INCBIN, load it at
  caption size as Type().mono(), and render console output + input in it so
  pretty-printed JSON columns and terminal text align. Falls back to the
  proportional caption font if unavailable.

Full-node + lite build clean; ctest green; source hygiene clean; sandboxed
startup smoke confirms the mono font loads + atlas builds without crashing.

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

src/embedded/embedded_fonts.cpp.in

@@ -11,6 +11,7 @@
 INCBIN(ubuntu_regular,  "@CMAKE_SOURCE_DIR@/res/fonts/Ubuntu-R.ttf");
 INCBIN(ubuntu_light,    "@CMAKE_SOURCE_DIR@/res/fonts/Ubuntu-Light.ttf");
 INCBIN(ubuntu_medium,   "@CMAKE_SOURCE_DIR@/res/fonts/Ubuntu-Medium.ttf");
+INCBIN(ubuntu_mono,     "@CMAKE_SOURCE_DIR@/res/fonts/UbuntuMono-R.ttf");
 INCBIN(material_icons,  "@CMAKE_SOURCE_DIR@/res/fonts/MaterialIcons-Regular.ttf");
 INCBIN(mdi_pickaxe_subset, "@CMAKE_SOURCE_DIR@/res/fonts/MaterialDesignIcons-Pickaxe-Subset.ttf");
 INCBIN(noto_cjk_subset, "@CMAKE_SOURCE_DIR@/res/fonts/NotoSansCJK-Subset.ttf");

src/embedded/embedded_fonts.h

@@ -24,6 +24,9 @@ extern "C" {
     extern const unsigned char g_ubuntu_medium_data[];
     extern const unsigned int  g_ubuntu_medium_size;
 
+    extern const unsigned char g_ubuntu_mono_data[];
+    extern const unsigned int  g_ubuntu_mono_size;
+
     extern const unsigned char g_material_icons_data[];
     extern const unsigned int  g_material_icons_size;