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.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "imgui.h"
+#include "console_channel.h"
 
 #include <string>
 
@@ -9,17 +9,15 @@ namespace ui {
 
 struct ConsoleOutputFilter {
     std::string text;
-    bool daemonMessagesEnabled = true;
-    bool errorsOnly = false;
-    bool rpcTraceEnabled = false;
-    bool appMessagesEnabled = true;   // "[app] ..." wallet log lines (matched by prefix, not color)
-    ImU32 daemonColor = 0;
-    ImU32 errorColor = 0;
-    ImU32 rpcTraceColor = 0;
+    bool daemonMessagesEnabled = true;   // Daemon + Xmrig (node log) channels
+    bool errorsOnly = false;             // keep only the Error channel
+    bool rpcTraceEnabled = false;        // Rpc channel
+    bool appMessagesEnabled = true;      // App channel
 };
 
+// Whether a line with the given channel + text passes the active filter.
 bool consoleLinePassesFilter(const std::string& lineText,
-                             ImU32 lineColor,
+                             ConsoleChannel channel,
                              const ConsoleOutputFilter& filter);
 
 } // namespace ui