feat: Implement OLED display support and custom icons for 128x32 displays

- Added OLED functionality in keymap.c with custom rendering for layers and modifiers.
- Created a Python script to generate simple icons for OLED displays.
- Introduced a new rules.mk file to enable OLED features for the keymap.
- Developed an OLED font helper script for visualizing and designing custom graphics.
- Redesigned OLED layout to fit 128x32 displays, optimizing space for logos and layer indicators.
- Implemented flow tap functionality in flow_tap.c for enhanced key responsiveness.

users/smathev/config.h

@@ -23,16 +23,21 @@
 // ============================================================================
 
 // Tapping and timing configuration
-#define TAPPING_TERM 140
-#define PERMISSIVE_HOLD         // Activate mod immediately when another key pressed
-#define AUTO_SHIFT_TIMEOUT 170  // Slightly longer than TAPPING_TERM
+#define TAPPING_TERM 200
+//#define FLOW_TAP
+//#define PERMISSIVE_HOLD         // Activate mod immediately when another key pressed _REDUNDANT due to SpeculativeHold
+#define AUTO_SHIFT_TIMEOUT 150  // Slightly longer than TAPPING_TERM
 #define RETRO_SHIFT             // Enable retroactive shift
 #define RETRO_TAPPING           // Enable retroactive tapping
 #define HOLD_ON_OTHER_KEY_PRESS // Enable hold on other key press
-#define CHORDAL_HOLD        // Enable chordal hold (mod activates if another key is pressed before tapping term)
+//#define CHORDAL_HOLD        // Enable chordal hold (mod activates if another key is pressed before tapping term)
+                            // DISABLED: Conflicts with multi-modifier shortcuts like Ctrl+Shift+P
 
 // Combo configuration
 #define CASEMODES_ENABLE
 #define COMBO_REF_DEFAULT _NORTO
 
+#ifdef OLED_ENABLE
+#define OLED_DISPLAY_128X32
+#endif