Merge 7089bf84c5 into 7185e5d287

## Summary

* This PR solves issue
https://github.com/crosspoint-reader/crosspoint-reader/issues/357 in the
first commit
* I then added an additional commit which means when you reach the end
of the keyboard, if you go 'beyond', you wrap back to the other side.
* This replaces existing behaviour, so if you would rather this be
removed, let me know and I'll just do the `caps` -> `shift` change

## Additional Context

### Screenshots for the new shift display

I thought it might not fit and need column size changes, but ended up
fitting fine, see screenshots showing this below:

<img width="573" height="366" alt="image"
src="https://github.com/user-attachments/assets/b8f6a4ec-94f5-4f5e-b9a6-06cc5f250ddb"
/>

<img width="570" height="308" alt="image"
src="https://github.com/user-attachments/assets/7d775518-4784-4120-a20a-a9dc67af8565"
/>


### Gif showing the wrap-around of the text



![IMG_7648](https://github.com/user-attachments/assets/7eec9066-e1cc-49a1-8b6b-a61556038d31)

---

### AI Usage

Did you use AI tools to help write this code? **PARTIALLY** - used to
double check the text wrapping had no edge-cases. (It did also suggest
rewriting the function, but I decided that was too big of a change for a
working part of the codebase, for now!)

lib/Xtc/Xtc.cpp

@@ -203,7 +203,7 @@ bool Xtc::generateCoverBmp() const {
   coverBmp.write(reinterpret_cast<const uint8_t*>(&colorsImportant), 4);
 
   // Color palette (2 colors for 1-bit)
-  // XTC uses inverted polarity: 0 = black, 1 = white
+  // XTC 1-bit polarity: 0 = black, 1 = white (standard BMP palette order)
   // Color 0: Black (text/foreground in XTC)
   uint8_t black[4] = {0x00, 0x00, 0x00, 0x00};
   coverBmp.write(black, 4);
@@ -506,8 +506,8 @@ bool Xtc::generateThumbBmp() const {
             // Bounds check for buffer access
             if (byteIdx < bitmapSize) {
               const uint8_t pixelBit = (pageBuffer[byteIdx] >> bitIdx) & 1;
-              // XTC polarity: 1=black, 0=white
-              grayValue = pixelBit ? 0 : 255;
+              // XTC 1-bit polarity: 0=black, 1=white (same as BMP palette)
+              grayValue = pixelBit ? 255 : 0;
             }
           }
 

src/activities/util/KeyboardEntryActivity.cpp

@@ -73,7 +73,7 @@ int KeyboardEntryActivity::getRowLength(const int row) const {
     case 3:
       return 10;  // zxcvbnm,./
     case 4:
-      return 10;  // caps (2 wide), space (5 wide), backspace (2 wide), OK
+      return 10;  // shift (2 wide), space (5 wide), backspace (2 wide), OK
     default:
       return 0;
   }
@@ -145,6 +145,11 @@ void KeyboardEntryActivity::loop() {
       // Clamp column to valid range for new row
       const int maxCol = getRowLength(selectedRow) - 1;
       if (selectedCol > maxCol) selectedCol = maxCol;
+    } else {
+      // Wrap to bottom row
+      selectedRow = NUM_ROWS - 1;
+      const int maxCol = getRowLength(selectedRow) - 1;
+      if (selectedCol > maxCol) selectedCol = maxCol;
     }
     updateRequired = true;
   }
@@ -154,16 +159,24 @@ void KeyboardEntryActivity::loop() {
       selectedRow++;
       const int maxCol = getRowLength(selectedRow) - 1;
       if (selectedCol > maxCol) selectedCol = maxCol;
+    } else {
+      // Wrap to top row
+      selectedRow = 0;
+      const int maxCol = getRowLength(selectedRow) - 1;
+      if (selectedCol > maxCol) selectedCol = maxCol;
     }
     updateRequired = true;
   }
 
   if (mappedInput.wasPressed(MappedInputManager::Button::Left)) {
+    const int maxCol = getRowLength(selectedRow) - 1;
+
     // Special bottom row case
     if (selectedRow == SPECIAL_ROW) {
       // Bottom row has special key widths
       if (selectedCol >= SHIFT_COL && selectedCol < SPACE_COL) {
-        // In shift key, do nothing
+        // In shift key, wrap to end of row
+        selectedCol = maxCol;
       } else if (selectedCol >= SPACE_COL && selectedCol < BACKSPACE_COL) {
         // In space bar, move to shift
         selectedCol = SHIFT_COL;
@@ -180,10 +193,9 @@ void KeyboardEntryActivity::loop() {
 
     if (selectedCol > 0) {
       selectedCol--;
-    } else if (selectedRow > 0) {
-      // Wrap to previous row
-      selectedRow--;
-      selectedCol = getRowLength(selectedRow) - 1;
+    } else {
+      // Wrap to end of current row
+      selectedCol = maxCol;
     }
     updateRequired = true;
   }
@@ -204,7 +216,8 @@ void KeyboardEntryActivity::loop() {
         // In backspace, move to done
         selectedCol = DONE_COL;
       } else if (selectedCol >= DONE_COL) {
-        // At done button, do nothing
+        // At done button, wrap to beginning of row
+        selectedCol = SHIFT_COL;
       }
       updateRequired = true;
       return;
@@ -212,9 +225,8 @@ void KeyboardEntryActivity::loop() {
 
     if (selectedCol < maxCol) {
       selectedCol++;
-    } else if (selectedRow < NUM_ROWS - 1) {
-      // Wrap to next row
-      selectedRow++;
+    } else {
+      // Wrap to beginning of current row
       selectedCol = 0;
     }
     updateRequired = true;
@@ -288,14 +300,14 @@ void KeyboardEntryActivity::render() const {
 
     // Handle bottom row (row 4) specially with proper multi-column keys
     if (row == 4) {
-      // Bottom row layout: CAPS (2 cols) | SPACE (5 cols) | <- (2 cols) | OK (2 cols)
+      // Bottom row layout: SHIFT (2 cols) | SPACE (5 cols) | <- (2 cols) | OK (2 cols)
       // Total: 11 visual columns, but we use logical positions for selection
 
       int currentX = startX;
 
-      // CAPS key (logical col 0, spans 2 key widths)
-      const bool capsSelected = (selectedRow == 4 && selectedCol >= SHIFT_COL && selectedCol < SPACE_COL);
-      renderItemWithSelector(currentX + 2, rowY, shiftActive ? "CAPS" : "caps", capsSelected);
+      // SHIFT key (logical col 0, spans 2 key widths)
+      const bool shiftSelected = (selectedRow == 4 && selectedCol >= SHIFT_COL && selectedCol < SPACE_COL);
+      renderItemWithSelector(currentX + 2, rowY, shiftActive ? "SHIFT" : "shift", shiftSelected);
       currentX += 2 * (keyWidth + keySpacing);
 
       // Space bar (logical cols 2-6, spans 5 key widths)