fix: add leds+midi to WebServerDeps, runtime apply for brightness (LED set_brightness) and channel_mode (pipeline routing_mode)

src/web/server.py

@@ -43,6 +43,8 @@ from ..system.tonedownload import (
 )
 from ..system.audio import AudioSystem, JackAudioClient, LATENCY_PROFILES
 from ..system.config import save_config
+from ..ui.leds import LEDController
+from ..midi.handler import MIDIHandler
 
 logger = logging.getLogger(__name__)
 
@@ -212,6 +214,10 @@ class WebServerDeps:
     config: Optional[dict] = None
     config_path: Optional[Path] = None
 
+    # Runtime subsystems (for live apply of settings changes)
+    leds: Optional[LEDController] = None
+    midi: Optional[MIDIHandler] = None
+
     @property
     def is_connected(self) -> bool:
         """True if we're wired to a live pedal instance (any channel)."""
@@ -1584,6 +1590,24 @@ class WebServer:
             save_config(cfg, self.deps.config_path)
             logger.info("Settings saved: %d keys from %s", n_saved, data)
 
+            # ── Runtime apply for live-updatable settings ──────────
+            if "brightness" in data and self.deps.leds is not None:
+                try:
+                    bv = data["brightness"]
+                    if isinstance(bv, (int, float)) and bv >= 1:
+                        bv = bv / 10.0
+                    self.deps.leds.set_brightness(float(bv))
+                except Exception as e:
+                    logger.warning("Failed to apply brightness: %s", e)
+
+            if "channel_mode" in data and self.deps.pipeline is not None:
+                try:
+                    mode = str(data["channel_mode"])
+                    self.deps.pipeline.routing_mode = "4cm" if mode == "stereo_4cm" else "mono"
+                    logger.info("Pipeline routing_mode set to %s", self.deps.pipeline.routing_mode)
+                except Exception as e:
+                    logger.warning("Failed to apply channel_mode: %s", e)
+
             return {"ok": True, "saved": n_saved}
 
         # ── FX block param schemas ───────────────────────────────