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>

res/themes/ui.toml

@@ -908,6 +908,7 @@ scroll-fade-zone     = { size = 24.0 }
 
 [tabs.console]
 input-area-padding = 8.0
+bg-darken-alpha = { size = 110.0 }   # black overlay alpha (0-255) for the terminal-dark output + input
 output-line-spacing = 2.0
 output = { line-spacing = 2 }
 scroll-multiplier = { size = 3.0 }