feat: Lyra Icons (#725)

/!\ This PR depends on
https://github.com/crosspoint-reader/crosspoint-reader/pull/732 being
merged first

Also requires the
https://github.com/open-x4-epaper/community-sdk/pull/18 PR

Lyra theme icons on the home menu, in the file browser and on empty book
covers

![IMG_8023
Medium](https://github.com/user-attachments/assets/ba7c1407-94d2-4353-80ff-d5b800c6ac5b)
![IMG_8024
Medium](https://github.com/user-attachments/assets/edb59e13-b1c9-4c86-bef3-c61cc8134e64)
![IMG_7958
Medium](https://github.com/user-attachments/assets/d3079ce1-95f0-43f4-bbc7-1f747cc70203)
![IMG_8033
Medium](https://github.com/user-attachments/assets/f3e2e03b-0fa8-47b7-8717-c0b71361b7a8)

- Added a function to the open-x4-sdk renderer to draw transparent
images
- Added a scripts/convert_icon.py script to convert svg/png icons into a
C array that can be directly imported into the project. Usage:
```bash
python ./scripts/convert_icon.py 'path/to/icon.png' cover 32 32
```
This will create a components/icons/cover.h file with a C array called
CoverIcon, of size 32x32px. Lyra uses icons from
https://lucide.dev/icons with a stroke width of 2px, that can be
downloaded with any desired size on the site.

> The file browser is noticeably slower with the addition of icons, and
using an image buffer like on the home page doesn't help very much. Any
suggestions to optimize this are welcome.

---

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**PARTIALLY**_
The icon conversion python script was generated by Copilot as I am not a
python dev.

---------

Co-authored-by: Dave Allie <dave@daveallie.com>

src/activities/home/HomeActivity.cpp

@@ -246,9 +246,12 @@ void HomeActivity::render(Activity::RenderLock&&) {
   // Build menu items dynamically
   std::vector<const char*> menuItems = {tr(STR_BROWSE_FILES), tr(STR_MENU_RECENT_BOOKS), tr(STR_FILE_TRANSFER),
                                         tr(STR_SETTINGS_TITLE)};
+  std::vector<UIIcon> menuIcons = {Folder, Recent, Transfer, Settings};
+
   if (hasOpdsUrl) {
     // Insert OPDS Browser after My Library
     menuItems.insert(menuItems.begin() + 2, tr(STR_OPDS_BROWSER));
+    menuIcons.insert(menuIcons.begin() + 2, Library);
   }
 
   GUI.drawButtonMenu(
@@ -257,7 +260,8 @@ void HomeActivity::render(Activity::RenderLock&&) {
            pageHeight - (metrics.headerHeight + metrics.homeTopPadding + metrics.verticalSpacing * 2 +
                          metrics.buttonHintsHeight)},
       static_cast<int>(menuItems.size()), selectorIndex - recentBooks.size(),
-      [&menuItems](int index) { return std::string(menuItems[index]); }, nullptr);
+      [&menuItems](int index) { return std::string(menuItems[index]); },
+      [&menuIcons](int index) { return menuIcons[index]; });
 
   const auto labels = mappedInput.mapLabels("", tr(STR_SELECT), tr(STR_DIR_UP), tr(STR_DIR_DOWN));
   GUI.drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);

src/activities/home/MyLibraryActivity.cpp

@@ -188,6 +188,14 @@ void MyLibraryActivity::loop() {
   });
 }
 
+std::string getFileName(std::string filename) {
+  if (filename.back() == '/') {
+    return filename.substr(0, filename.length() - 1);
+  }
+  const auto pos = filename.rfind('.');
+  return filename.substr(0, pos);
+}
+
 void MyLibraryActivity::render(Activity::RenderLock&&) {
   renderer.clearScreen();
 
@@ -205,7 +213,8 @@ void MyLibraryActivity::render(Activity::RenderLock&&) {
   } else {
     GUI.drawList(
         renderer, Rect{0, contentTop, pageWidth, contentHeight}, files.size(), selectorIndex,
-        [this](int index) { return files[index]; }, nullptr, nullptr, nullptr);
+        [this](int index) { return getFileName(files[index]); }, nullptr,
+        [this](int index) { return UITheme::getFileIcon(files[index]); });
   }
 
   // Help text

src/activities/home/RecentBooksActivity.cpp

@@ -102,7 +102,7 @@ void RecentBooksActivity::render(Activity::RenderLock&&) {
     GUI.drawList(
         renderer, Rect{0, contentTop, pageWidth, contentHeight}, recentBooks.size(), selectorIndex,
         [this](int index) { return recentBooks[index].title; }, [this](int index) { return recentBooks[index].author; },
-        nullptr, nullptr);
+        [this](int index) { return UITheme::getFileIcon(recentBooks[index].path); });
   }
 
   // Help text

src/activities/network/NetworkModeSelectionActivity.cpp

@@ -70,11 +70,12 @@ void NetworkModeSelectionActivity::render(Activity::RenderLock&&) {
                                                        StrId::STR_CREATE_HOTSPOT};
   static constexpr StrId menuDescs[MENU_ITEM_COUNT] = {StrId::STR_JOIN_DESC, StrId::STR_CALIBRE_DESC,
                                                        StrId::STR_HOTSPOT_DESC};
+  static constexpr UIIcon menuIcons[MENU_ITEM_COUNT] = {UIIcon::Wifi, UIIcon::Library, UIIcon::Hotspot};
 
   GUI.drawList(
       renderer, Rect{0, contentTop, pageWidth, contentHeight}, static_cast<int>(MENU_ITEM_COUNT), selectedIndex,
       [](int index) { return std::string(I18N.get(menuItems[index])); },
-      [](int index) { return std::string(I18N.get(menuDescs[index])); });
+      [](int index) { return std::string(I18N.get(menuDescs[index])); }, [](int index) { return menuIcons[index]; });
 
   // Draw help text at bottom
   const auto labels = mappedInput.mapLabels(tr(STR_BACK), tr(STR_SELECT), "", "");