feat: scaffold users/matej shared QMK userspace

users/matej/config.h

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+#pragma once

users/matej/matej.c

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+/* Copyright 2026 Matej Janežič
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "matej.h"
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    switch (keycode) {
+        case M_DSC_SEP:
+            if (record->event.pressed) {
+                SEND_STRING(SS_LSFT(SS_TAP(X_SCLN)) SS_DELAY(100) SS_LSFT(SS_TAP(X_MINUS)) SS_DELAY(100) SS_LSFT(SS_TAP(X_MINUS)) SS_DELAY(100) SS_LSFT(SS_TAP(X_SCLN)) SS_DELAY(100) SS_TAP(X_ENTER));
+            }
+            return false;
+        case M_BASE_PEEK:
+            if (record->event.pressed)
+                layer_off(_GAME);
+            else
+                layer_on(_GAME);
+            return false;
+    }
+    return true;
+}
+
+void keyboard_post_init_user(void) {
+    rgb_matrix_enable();
+}
+
+extern rgb_config_t rgb_matrix_config;
+
+static void set_layer_color_hsv(uint8_t h, uint8_t s, uint8_t v) {
+    HSV     hsv   = {h, s, v};
+    RGB     rgb   = hsv_to_rgb(hsv);
+    uint8_t scale = rgb_matrix_config.hsv.v;
+    rgb_matrix_set_color_all((rgb.r * scale) / 255, (rgb.g * scale) / 255, (rgb.b * scale) / 255);
+}
+
+bool rgb_matrix_indicators_user(void) {
+    switch (get_highest_layer(layer_state)) {
+        case _BASE:
+            set_layer_color_hsv(74, 218, 204);
+            break;
+        case _FN:
+            set_layer_color_hsv(41, 255, 255);
+            break;
+        case _NAV:
+            set_layer_color_hsv(152, 255, 255);
+            break;
+        case _GAME:
+            set_layer_color_hsv(0, 255, 200);
+            break;
+    }
+    return true;
+}

users/matej/matej.h

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+#pragma once
+
+#include "quantum.h"
+
+enum layers {
+    _BASE,
+    _FN,
+    _NAV,
+    _GAME,
+};
+
+enum custom_keycodes {
+    M_DSC_SEP = SAFE_RANGE,
+    M_BASE_PEEK,
+};

users/matej/rules.mk

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+SRC += matej.c