merge upstream/master: logging pragma, screenshot retrieval, nbsp fix

Merge 3 upstream commits into mod/master:
- feat: Allow screenshot retrieval from device (#820)
- feat: Add central logging pragma (#843)
- fix: Account for nbsp character as non-breaking space (#757)

Conflict resolution:
- src/main.cpp: kept mod's HalPowerManager + upstream's Logging/screenshot
- SleepActivity.cpp: kept mod's letterbox fill rework, applied LOG_* pattern

Additional changes for logging compatibility:
- Converted remaining Serial.printf calls in mod files to LOG_* macros
  (HalPowerManager, BookSettings, BookmarkStore, GfxRenderer)
- Added ENABLE_SERIAL_LOG and LOG_LEVEL=2 to [env:mod] build flags

Co-authored-by: Cursor <cursoragent@cursor.com>

src/components/UITheme.cpp

@@ -1,6 +1,7 @@
 #include "UITheme.h"
 
 #include <GfxRenderer.h>
+#include <Logging.h>
 
 #include <memory>
 
@@ -23,12 +24,12 @@ void UITheme::reload() {
 void UITheme::setTheme(CrossPointSettings::UI_THEME type) {
   switch (type) {
     case CrossPointSettings::UI_THEME::CLASSIC:
-      Serial.printf("[%lu] [UI] Using Classic theme\n", millis());
+      LOG_DBG("UI", "Using Classic theme");
       currentTheme = new BaseTheme();
       currentMetrics = &BaseMetrics::values;
       break;
     case CrossPointSettings::UI_THEME::LYRA:
-      Serial.printf("[%lu] [UI] Using Lyra theme\n", millis());
+      LOG_DBG("UI", "Using Lyra theme");
       currentTheme = new LyraTheme();
       currentMetrics = &LyraMetrics::values;
       break;

src/components/themes/BaseTheme.cpp

@@ -2,6 +2,7 @@
 
 #include <GfxRenderer.h>
 #include <HalStorage.h>
+#include <Logging.h>
 #include <Utf8.h>
 
 #include <cstdint>
@@ -311,7 +312,7 @@ void BaseTheme::drawRecentBookCover(GfxRenderer& renderer, Rect rect, const std:
       if (Storage.openFileForRead("HOME", coverBmpPath, file)) {
         Bitmap bitmap(file);
         if (bitmap.parseHeaders() == BmpReaderError::Ok) {
-          Serial.printf("Rendering bmp\n");
+          LOG_DBG("THEME", "Rendering bmp");
           // Calculate position to center image within the book card
           int coverX, coverY;
 
@@ -345,7 +346,7 @@ void BaseTheme::drawRecentBookCover(GfxRenderer& renderer, Rect rect, const std:
 
           // First render: if selected, draw selection indicators now
           if (bookSelected) {
-            Serial.printf("Drawing selection\n");
+            LOG_DBG("THEME", "Drawing selection");
             renderer.drawRect(bookX + 1, bookY + 1, bookWidth - 2, bookHeight - 2);
             renderer.drawRect(bookX + 2, bookY + 2, bookWidth - 4, bookHeight - 4);
           }