major session: transport lasso layout, MIDI learn wiring, note passthrough, log windows, lock preset, CC blocking

- transport widget restructured to two-group lasso layout (grp_learn + grp_cc) matching fader/toggle pattern
- fixed MIDI learn for transport (bind_hw_cc channel param) and preset browser (wired to check_and_start_midi_learn)
- transport HW routing now respects output_mode and trigger_mode; OSC mode fires on any value, MIDI momentary fires on any value
- preset browser on_hw_trigger fires on any value (0 or 127 both send 127 out)
- unbound CCs are dropped, no passthrough; notes (0x80/0x90) pass through freely to midi_out
- four MIDI/OSC log windows: OSC In, OSC Out, MIDI In, MIDI Out with formatted note/CC display
- midi_out_signal now carries message list for logging
- lock preset checkbox: always defaults to True on launch, not persisted
- transport cc_output_lbl always visible, content adapts to MIDI/OSC mode
- preset browser show/hide saves and restores correctly per preset
- CLAUDE.md added with full project architecture, conventions, and planned features

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

presets/presets.json

@@ -1,5 +1,5 @@
 {
-  "__last_used__": "preset5",
+  "__last_used__": "preset3",
   "presets": {
     "preset1": {
       "faders": [
@@ -143,14 +143,29 @@
         }
       ],
       "browser": {
-        "back_cc": 22,
-        "fwd_cc": 23
+        "back": {
+          "label": "Back",
+          "cc": 22,
+          "ch": 1,
+          "hw_cc": null,
+          "hw_channel": null,
+          "trigger_mode": "momentary"
+        },
+        "fwd": {
+          "label": "Fwd",
+          "cc": 23,
+          "ch": 1,
+          "hw_cc": null,
+          "hw_channel": null,
+          "trigger_mode": "momentary"
+        }
       },
-      "preset_uuid": "f230a4fd-edc3-4c4b-8585-f73c82168fee",
+      "preset_uuid": "8cbceb6b-ba5d-4b2c-8989-f921e4e3150d",
       "show_hide": {
         "fader": false,
         "toggle": false,
-        "transport": false
+        "transport": false,
+        "browser": false
       }
     },
     "preset2": {
@@ -248,11 +263,11 @@
           "trigger_mode": "momentary"
         }
       },
-      "preset_uuid": "e658b6bf-4bb7-4d68-bd8b-07775ee80c53",
+      "preset_uuid": "7483fb5b-f47f-49e4-bccb-e8d20195078c",
       "show_hide": {
         "fader": false,
         "toggle": false,
-        "transport": true,
+        "transport": false,
         "browser": true
       }
     },
@@ -268,14 +283,14 @@
         {
           "uid": "14ec66c2-6a0a-418e-9240-776cb13f6e2e",
           "label": "Fader 1",
-          "cc": 1,
-          "ch": 1,
-          "value": 64,
+          "cc": 90,
+          "ch": 15,
+          "value": 85,
           "color": "Gray",
           "pickup": false,
-          "last_sent": 64,
-          "hw_cc": null,
-          "hw_channel": null,
+          "last_sent": 85,
+          "hw_cc": 67,
+          "hw_channel": 1,
           "zone": null,
           "center_index": null,
           "zone_index": null
@@ -371,7 +386,21 @@
           "zone_index": null
         }
       ],
-      "toggles": [],
+      "toggles": [
+        {
+          "uid": "46f17f40-1bb2-4527-b6c5-fd26e535beed",
+          "label": "Toggle 1",
+          "cc": 20,
+          "ch": 1,
+          "state": false,
+          "color": "Gray",
+          "zone": null,
+          "center_index": null,
+          "zone_index": null,
+          "hw_cc": null,
+          "hw_channel": null
+        }
+      ],
       "browser": {
         "back": {
           "label": "Back",