Implement UI scaling and more (#501)

**New Features**
 * Runtime font accessors and new symbol fonts for text, launcher, statusbar, and shared icons.
 * Added font height base setting to device.properties
 * Text fonts now have 3 sizes: small, default, large

**Improvements**
 * Renamed `UiScale` to `UiDensity`
 * Statusbar, toolbar and many UI components now compute heights and spacing from fonts/density.
 * SSD1306 initialization sequence refined for more stable startup.
 * Multiple image assets replaced by symbol-font rendering.
 * Many layout improvements related to density, font scaling and icon scaling
 * Updated folder name capitalization for newer style

Tactility/Source/app/systeminfo/SystemInfo.cpp

@@ -1,15 +1,16 @@
 #include <Tactility/TactilityConfig.h>
-#include <Tactility/lvgl/Toolbar.h>
 #include <Tactility/lvgl/LvglSync.h>
+#include <Tactility/lvgl/Toolbar.h>
 
-#include <Tactility/Assets.h>
-#include <tactility/hal/Device.h>
+#include <Tactility/hal/sdcard/SdCardDevice.h>
 #include <Tactility/Tactility.h>
 #include <Tactility/Timer.h>
 
 #include <algorithm>
 #include <format>
 #include <lvgl.h>
+#include <tactility/lvgl_fonts.h>
+#include <tactility/hal/Device.h>
 #include <tactility/lvgl_symbols_shared.h>
 #include <utility>
 #include <cstring>
@@ -139,7 +140,8 @@ static MemoryBarWidgets createMemoryBar(lv_obj_t* parent, const char* label) {
 
     auto* left_label = lv_label_create(container);
     lv_label_set_text(left_label, label);
-    lv_obj_set_width(left_label, 60);
+    auto label_width = 6 * lvgl_get_text_font_height(FONT_SIZE_DEFAULT);
+    lv_obj_set_width(left_label, label_width);
 
     auto* bar = lv_bar_create(container);
     lv_obj_set_flex_grow(bar, 1);
@@ -148,7 +150,7 @@ static MemoryBarWidgets createMemoryBar(lv_obj_t* parent, const char* label) {
     lv_obj_set_width(bottom_label, LV_PCT(100));
     lv_obj_set_style_text_align(bottom_label, LV_TEXT_ALIGN_RIGHT, 0);
 
-    if (hal::getConfiguration()->uiScale == hal::UiScale::Smallest) {
+    if (hal::getConfiguration()->uiDensity == hal::UiDensity::Compact) {
         lv_obj_set_style_pad_bottom(bottom_label, 2, LV_STATE_DEFAULT);
     } else {
         lv_obj_set_style_pad_bottom(bottom_label, 12, LV_STATE_DEFAULT);
@@ -436,7 +438,6 @@ class SystemInfoApp final : public App {
         // Summary
         auto* summary_label = lv_label_create(psramContainer);
         lv_label_set_text(summary_label, "PSRAM Usage Summary");
-        lv_obj_set_style_text_font(summary_label, &lv_font_montserrat_14, 0);
         lv_obj_set_style_pad_bottom(summary_label, 8, 0);
 
         // Current usage
@@ -477,7 +478,6 @@ class SystemInfoApp final : public App {
         // PSRAM Configuration section
         auto* config_header = lv_label_create(psramContainer);
         lv_label_set_text(config_header, "PSRAM Configuration");
-        lv_obj_set_style_text_font(config_header, &lv_font_montserrat_14, 0);
         lv_obj_set_style_pad_bottom(config_header, 8, 0);
 
         // Get threshold from sdkconfig
@@ -514,7 +514,6 @@ class SystemInfoApp final : public App {
         // Known PSRAM consumers header
         auto* consumers_label = lv_label_create(psramContainer);
         lv_label_set_text(consumers_label, "PSRAM Allocation Strategy");
-        lv_obj_set_style_text_font(consumers_label, &lv_font_montserrat_14, 0);
         lv_obj_set_style_pad_bottom(consumers_label, 8, 0);
 
         // Explain what's in PSRAM
@@ -554,7 +553,6 @@ class SystemInfoApp final : public App {
         // App behavior explanation
         auto* app_behavior_label = lv_label_create(psramContainer);
         lv_label_set_text(app_behavior_label, "App Memory Behavior");
-        lv_obj_set_style_text_font(app_behavior_label, &lv_font_montserrat_14, 0);
         lv_obj_set_style_pad_bottom(app_behavior_label, 8, 0);
 
         auto* app_note1 = lv_label_create(psramContainer);
@@ -585,7 +583,8 @@ class SystemInfoApp final : public App {
 
         auto* tabview = lv_tabview_create(wrapper);
         lv_tabview_set_tab_bar_position(tabview, LV_DIR_LEFT);
-        lv_tabview_set_tab_bar_size(tabview, 80);
+        auto tab_bar_width = 6 * lvgl_get_text_font_height(FONT_SIZE_DEFAULT);
+        lv_tabview_set_tab_bar_size(tabview, tab_bar_width);
 
         // Create tabs
         auto* memory_tab = createTab(tabview, "Memory");
@@ -645,7 +644,6 @@ class SystemInfoApp final : public App {
         // CPU tab - summary at top
         cpuSummaryLabel = lv_label_create(cpu_tab);
         lv_label_set_text(cpuSummaryLabel, "Overall CPU Usage: --.-%");
-        lv_obj_set_style_text_font(cpuSummaryLabel, &lv_font_montserrat_14, 0);
         lv_obj_set_style_pad_bottom(cpuSummaryLabel, 4, 0);
         
         taskCountLabel = lv_label_create(cpu_tab);