Address cppcheck complaints

src/activities/home/FileBrowserActivity.cpp

@@ -256,7 +256,7 @@ void FileBrowserActivity::loop() {
 
 std::string getFileName(std::string filename) {
   if (filename.back() == '/') {
-    filename = filename.substr(0, filename.length() - 1);
+    filename.pop_back();
     if (!UITheme::getInstance().getTheme().showsFileIcons()) {
       return "[" + filename + "]";
     }

src/activities/reader/EpubReaderActivity.cpp

@@ -466,15 +466,6 @@ void EpubReaderActivity::onReaderMenuConfirm(EpubReaderMenuActivity::MenuAction
       if (KOREADER_STORE.hasCredentials()) {
         const int currentPage = section ? section->currentPage : 0;
         const int totalPages = section ? section->pageCount : 0;
-        // Look up paragraph index from section cache for accurate XPath generation on upload
-        uint16_t paragraphIdx = 0;
-        bool hasParagraphIdx = false;
-        if (section) {
-          if (const auto pIdx = section->getParagraphIndexForPage(currentPage)) {
-            paragraphIdx = *pIdx;
-            hasParagraphIdx = true;
-          }
-        }
         startActivityForResult(std::make_unique<KOReaderSyncActivity>(renderer, mappedInput, epub, epub->getPath(),
                                                                       currentSpineIndex, currentPage, totalPages),
                                [this](const ActivityResult& result) { handleSyncResult(result); });

src/activities/weather/WeatherActivity.cpp

@@ -41,7 +41,6 @@ void drawWeatherIconWithOrientation(const GfxRenderer& renderer, const uint8_t*
   }
 }
 
-
 StrId getWeatherDescriptionStrId(const int wmoCode) {
   switch (wmoCode) {
     case 0:
@@ -597,8 +596,6 @@ void WeatherActivity::renderDailyForecast(int x, int y, int w, int h) {
   const int extraPx = w % numDays;
 
   int cardX = x;
-  int debugMoonX = x + w - 18;
-  int debugMoonYBase = y + 10;
 
   for (int i = 0; i < numDays; i++) {
     const auto& day = weatherData.daily[i];

src/components/themes/BaseTheme.cpp

@@ -276,7 +276,7 @@ void BaseTheme::drawList(const GfxRenderer& renderer, Rect rect, int itemCount,
       std::string subtitleText = rowSubtitle(i);
       const auto nl = subtitleText.find('\n');
       if (nl != std::string::npos) {
-        subtitleText = subtitleText.substr(0, nl) + " \u2022 " + subtitleText.substr(nl + 1);
+        subtitleText.replace(nl, 1, " \u2022 ");
       }
       auto subtitle = renderer.truncatedText(UI_10_FONT_ID, subtitleText.c_str(), textWidth);
       renderer.drawText(UI_10_FONT_ID, rect.x + BaseMetrics::values.contentSidePadding, itemY + 30, subtitle.c_str(),