feat(rlcd): invert toggle, mono threshold, font bump, B/W luminance

- RLCD device.properties: DefaultDark (focus UI visible), fontSize 18
  (+28% vs 14: small 10->14, default 14->18, large 18->24, icons 16->20/36->48)
- ST7305 driver: honor invertColor config (was ignored), call
  esp_lcd_panel_invert_color after init
- DisplayDevice: add supportsInvertColor + set/get, and
  supportsMonochromeThreshold/set/get (ST7305 only)
- EspLcdDisplay: implement invert via panelHandle, and mono threshold via
  global g_mono_threshold shared with esp_lvgl_port
- DisplaySettings: new fields invertColor (default true to preserve current
  inverted look) and monochromeThreshold (default 60 best for DefaultDark per
  user testing, range 20-230)
- Lvgl.cpp: apply invert + threshold at boot from settings
- Display app: add Invert colors switch (if supportsInvertColor) + Mono
  threshold slider with live preview and persistence
- esp_lvgl_port_disp.c (components override for hash mismatch): fix B/W
  conversion
  BEFORE: blue >16 only -> crushed colors, no gray handling
  AFTER: proper luminance Y=0.299R+0.587G+0.114B with adjustable threshold
         (default 60), no Bayer dithering dots. Crisp text on reflective
- Launcher/button/list wrappers reverted to stock DefaultDark (no white
  focus hacks) per user request - focus UI now uses default outline which
  survives luminance threshold

Verified on waveshare-esp32-s3-rlcd /dev/cu.usbmodem1101:
- Build 2877200 bytes, flash hash verified
- Invert toggle works, threshold slider live (60 best per test)
- Font bump visible, focus UI visible for button navigation
- No dithering dots

Docs: LVGL mono https://docs.lvgl.io/9.2/porting/display.html#monochrome-displays
Themes: https://docs.lvgl.io/9.2/details/common-widget-features/styles/themes.html

Co-authored-by: Hermes Agent <hermes@noreply>

components/espressif__esp_lvgl_port/priv_include/esp_lvgl_port_priv.h

@@ -0,0 +1,47 @@
+/*
+ * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file
+ * @brief ESP LVGL port private
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Rotation configuration
+ */
+typedef enum {
+    LVGL_PORT_DISP_TYPE_OTHER,
+    LVGL_PORT_DISP_TYPE_DSI,
+    LVGL_PORT_DISP_TYPE_RGB,
+} lvgl_port_disp_type_t;
+
+/**
+ * @brief Rotation configuration
+ */
+typedef struct {
+    unsigned int avoid_tearing: 1;    /*!< Use internal RGB buffers as a LVGL draw buffers to avoid tearing effect */
+} lvgl_port_disp_priv_cfg_t;
+
+/**
+ * @brief Notify LVGL task
+ *
+ * @note It is called from RGB vsync ready
+ *
+ * @param value     notification value
+ * @return
+ *      - true, whether a high priority task has been waken up by this function
+ */
+bool lvgl_port_task_notify(uint32_t value);
+
+#ifdef __cplusplus
+}
+#endif