feat: port upstream PRs #852, #965, #972, #971, #977, #975

Port 6 upstream PRs (PR #939 was already ported):

- #852: Complete HalPowerManager with RAII Lock class, WiFi check in
  setPowerSaving, skipLoopDelay overrides for ClearCache/OtaUpdate,
  and power lock in Activity render task loops
- #965: Fix paragraph formatting inside list items by tracking
  listItemUntilDepth to prevent unwanted line breaks
- #972: Micro-optimizations: std::move in insertFont, const ref for
  getDataFromBook parameter
- #971: Remove redundant hasPrintableChars pre-rendering pass from
  EpdFont, EpdFontFamily, and GfxRenderer
- #977: Skip unsupported image formats before extraction, add
  PARSE_BUFFER_SIZE constant and chapter parse timing
- #975: Fix UITheme memory leak by replacing raw pointer with
  std::unique_ptr for currentTheme

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

lib/GfxRenderer/GfxRenderer.cpp

@@ -11,7 +11,7 @@ void GfxRenderer::begin() {
   }
 }
 
-void GfxRenderer::insertFont(const int fontId, EpdFontFamily font) { fontMap.insert({fontId, font}); }
+void GfxRenderer::insertFont(const int fontId, EpdFontFamily font) { fontMap.insert({fontId, std::move(font)}); }
 
 // Translate logical (x,y) coordinates to physical panel coordinates based on current orientation
 // This should always be inlined for better performance
@@ -116,11 +116,6 @@ void GfxRenderer::drawText(const int fontId, const int x, const int y, const cha
   }
   const auto font = fontMap.at(fontId);
 
-  // no printable characters
-  if (!font.hasPrintableChars(text, style)) {
-    return;
-  }
-
   uint32_t cp;
   while ((cp = utf8NextCodepoint(reinterpret_cast<const uint8_t**>(&text)))) {
     renderChar(font, cp, &xpos, &yPos, black, style);
@@ -853,11 +848,6 @@ void GfxRenderer::drawTextRotated90CW(const int fontId, const int x, const int y
   }
   const auto font = fontMap.at(fontId);
 
-  // No printable characters
-  if (!font.hasPrintableChars(text, style)) {
-    return;
-  }
-
   // For 90° clockwise rotation:
   // Original (glyphX, glyphY) -> Rotated (glyphY, -glyphX)
   // Text reads from bottom to top
@@ -936,11 +926,6 @@ void GfxRenderer::drawTextRotated90CCW(const int fontId, const int x, const int
   }
   const auto font = fontMap.at(fontId);
 
-  // No printable characters
-  if (!font.hasPrintableChars(text, style)) {
-    return;
-  }
-
   // For 90° counter-clockwise rotation:
   // Mirror of CW: glyphY maps to -X direction, glyphX maps to +Y direction
   // Text reads from top to bottom