refactor(console): phase 2 — channel-as-semantic key; decouple executor from UI colors

Make ConsoleChannel the canonical semantic classification of every console
line. Producers (command executor, app log forwarders, result formatter) tag
each line with a channel; the UI derives both the text color and the left
accent-bar color from it at draw time, and the output filter keys off it.

This replaces the prior scheme of storing an ImU32 color per line and then
reverse-engineering the source from color-equality plus a "[daemon] "/"[xmrig] "
/"[app] "/"[rpc] " text prefix. Consequences:

- ConsoleLine now stores {text, ConsoleChannel} — no per-line color.
- addLine()/addRpcTraceLine() take a channel; the redundant text prefixes are
  gone (the accent bar carries the origin).
- The executor's ConsoleAddLineFn hands a channel, not an ImU32, so the backend
  no longer depends on ConsoleTab::COLOR_* — FullNode/Lite executors emit clean
  text + channel.
- The theme-remap loop that rewrote stored colors on light/dark flip is deleted;
  colors are resolved per-channel each frame (refreshColors on flip only).
- ConsoleOutputFilter drops its color fields; consoleLinePassesFilter() keys off
  the channel. Test updated to the channel-based API.
- Added a Warning channel (amber severity peer of Error/Success) so the
  notification + logger warning forwarders keep their color.

Full-node + lite build clean; ctest green; source hygiene clean.

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

src/ui/windows/console_output_model.cpp

@@ -16,14 +16,14 @@ std::string lowerCopy(std::string value)
 }
 
 bool consoleLinePassesFilter(const std::string& lineText,
-                             ImU32 lineColor,
+                             ConsoleChannel channel,
                              const ConsoleOutputFilter& filter)
 {
-    if (!filter.daemonMessagesEnabled && lineColor == filter.daemonColor) return false;
-    if (!filter.rpcTraceEnabled && lineColor == filter.rpcTraceColor) return false;
-    // "[app] ..." lines share COLOR_INFO with other info text, so match them by prefix.
-    if (!filter.appMessagesEnabled && lineText.rfind("[app] ", 0) == 0) return false;
-    if (filter.errorsOnly && lineColor != filter.errorColor) return false;
+    if (!filter.daemonMessagesEnabled &&
+        (channel == ConsoleChannel::Daemon || channel == ConsoleChannel::Xmrig)) return false;
+    if (!filter.rpcTraceEnabled && channel == ConsoleChannel::Rpc) return false;
+    if (!filter.appMessagesEnabled && channel == ConsoleChannel::App) return false;
+    if (filter.errorsOnly && channel != ConsoleChannel::Error) return false;
     if (!filter.text.empty()) {
         std::string needle = lowerCopy(filter.text);
         std::string haystack = lowerCopy(lineText);