v0.9.5 beta — full feature build ready for distribution

Core additions since initial commit:
- Platform-split MIDI (midi_linux.c / midi_windows.c)
- Patch system: save/load/scan, subdirectory navigation, favourites
- Config system: last MIDI device and CC mappings persisted to disk
- Custom embedded pixel font and sprite sheet (no loose asset files at runtime)
- Window icon embedded at runtime (SetWindowIcon) and in Windows .exe (windres)
- chdirToExeDir() in platform.c so double-click launch finds patches/ correctly
- About screen accessible from Master panel

UI polish:
- TITLE_BAR_H constant (20 px) — sprite buttons now fit inside title bars
- All title bar text, button overlay text, and close/active labels vertically centred
- Full-screen dim overlay computed from camera transform (no more partial coverage)
- Patch browser: folder navigation, breadcrumb title, 256-slot limit lifted

Build:
- Makefile auto-discovers sources; embeds sprites/font/icon via xxd rules
- Windows cross-compile: make PLATFORM=windows (mingw-w64 + windres)
- windows.h isolated in platform.c to avoid Rectangle/CloseWindow conflicts with raylib.h
- WIN_RES uses lazy = assignment so OBJ_DIR expands correctly for windres output path

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

include/ui.h

@@ -0,0 +1,110 @@
+#ifndef UI_H
+#define UI_H
+
+#include "raylib.h"
+#include "synth.h"
+#include "midi.h"
+#include "patch.h"
+#include "config.h"
+
+typedef struct {
+    int    id;
+    float *valuePtr;
+    float  min;
+    float  max;
+} UIControlEntry;
+
+// Sprite indices
+typedef enum {
+    SPRITE_WAVE_SINE = 0,
+    SPRITE_WAVE_TRIANGLE,
+    SPRITE_WAVE_SAW,
+    SPRITE_WAVE_RAMP,
+    SPRITE_WAVE_PULSE,
+    SPRITE_WAVE_NOISE,
+    SPRITE_BTN_RED,
+    SPRITE_BTN_GREEN,
+    SPRITE_SLIDER,
+    SPRITE_KNOB
+} SpriteIndex;
+
+// UI state that needs to persist between frames
+typedef struct {
+    Texture2D sprites;
+    Font      font;
+    MidiState *midi;
+    Camera2D *camera;
+    // About menu state
+    int       aboutMenuOpen;
+
+    // MIDI menu state
+    int       midiMenuOpen;
+    int       midiMenuSelected;  // -1 if none
+
+    // Knob drag state
+    int       draggingKnob;      // -1 if none
+    Vector2   dragStart;
+    float     dragStartValue;
+
+    // Slider drag state
+    int       draggingSlider;    // -1 if none
+
+    // MIDI learn state
+    int       midiLearnActive;   // 0=off 1=click a control 2=wiggle CC
+    int       midiLearnTargetId; // id of selected control (-1 if none)
+    float    *midiLearnValuePtr;
+    float     midiLearnMin;
+    float     midiLearnMax;
+
+    // Patch browser state
+    int  patchMenuOpen;
+    int  focusedTextInput;                          // -1 if none
+    int  patchConfirmOverwrite;
+    int  patchConfirmClear;
+    char patchSaveName[PATCH_NAME_LEN];
+    char patchCurrentName[PATCH_NAME_LEN];
+    int  patchFileCount;
+    char patchFiles[PATCH_MAX_FILES][PATCH_NAME_LEN];
+    int  patchScrollOffset;
+    int  patchShowFavsOnly;
+    char patchFavs[PATCH_MAX_FILES][PATCH_NAME_LEN];
+    int  patchFavCount;
+    char patchCurrentDir[256];
+    char patchSubDirs[PATCH_MAX_DIRS][PATCH_NAME_LEN];
+    int  patchSubDirCount;
+
+    // Control registry — built lazily by uiKnob/uiSlider for CC mapping persistence
+    UIControlEntry controlRegistry[128];
+    int            controlRegistryCount;
+    // CC mappings loaded from file but not yet resolved (registry not yet populated)
+    ConfigCcEntry  pendingMappings[128];
+    int            pendingCount;
+} UIState;
+
+// Lifecycle
+void uiInit(UIState *ui, MidiState *midi, Camera2D *camera);
+void uiClose(UIState *ui);
+
+// Primitives
+float uiKnob(UIState *ui, int id, float x, float y, float *ptr, float min, float max, const char *label);
+float uiSlider(UIState *ui, int id, float x, float y, float width, float *ptr, float min, float max, const char *label);
+int   uiWaveformSelector(UIState *ui, float x, float y, int currentWaveform);
+void  uiADSRShape(float x, float y, float width, float height, float attack, float decay, float sustain, float release, Color color);
+void  uiVoiceMeter(UIState *ui, float x, float y, Voice *voices, int voiceCount);
+
+// Panels
+void uiOscillatorPanel(UIState *ui, int baseId, float x, float y, float width, float height, Oscillator *osc, const char *title);
+void uiEnvelopePanel(UIState *ui, int baseId, float x, float y, float width, float height, Envelope *env, const char *title);
+void uiLfoPanel(UIState *ui, int baseId, float x, float y, float width, float height, LFO *lfo, const char *title);
+void uiFilterPanel(UIState *ui, float x, float y, float width, float height, Filter *filter, const char *title);
+void uiMasterPanel(UIState *ui, float x, float y, float width, float height, Synth *s);
+void uiMidiMenu(UIState *ui, float x, float y, float width, MidiState *midi);
+void uiPatchMenu(UIState *ui, float x, float y, float width, Synth *s);
+void uiAboutMenu(UIState *ui, float x, float y, float width);
+void uiLoadCcMappingsForDevice(UIState *ui, const char *deviceName);
+
+// Window helpers
+
+void recomputeViewPort(Camera2D* camera, int x_logical_resolution, int y_logical_resolution, int border_width);
+
+#endif