feat: allow removing book from recent list (#2045)

## Summary

Add ability to long press 'confirm' on a book in the recent books list
to be prompted to remove it from the list.

---

### AI Usage

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? *Yes, Claude*

---------

src/activities/home/RecentBooksActivity.cpp

@@ -5,14 +5,17 @@
 #include <I18n.h>
 
 #include <algorithm>
+#include <memory>
 
 #include "MappedInputManager.h"
 #include "RecentBooksStore.h"
+#include "activities/util/ConfirmationActivity.h"
 #include "components/UITheme.h"
 #include "fontIds.h"
 
 namespace {
-constexpr unsigned long GO_HOME_MS = 1000;
+// Hold threshold for the long-press "remove from list" action (firmware convention).
+constexpr unsigned long LONG_PRESS_MS = 1000;
 }  // namespace
 
 void RecentBooksActivity::loadRecentBooks() { recentBooks = RECENT_BOOKS.getBooks(); }
@@ -41,6 +44,25 @@ void RecentBooksActivity::onExit() {
 void RecentBooksActivity::loop() {
   const int pageItems = UITheme::getInstance().getNumberOfItemsPerPage(renderer, true, false, true, true);
 
+  // After a long-press has fired, swallow input until Confirm is physically released
+  // (so the release doesn't also open the book; re-arm only once the button is up).
+  if (longPressFired) {
+    if (!mappedInput.isPressed(MappedInputManager::Button::Confirm)) {
+      longPressFired = false;
+    }
+    return;
+  }
+
+  // Long-press Confirm on the selected book: prompt to remove it from the list.
+  // Fires when the hold times out while still held (firmware hold-to-act pattern,
+  // cf. FileBrowserActivity BACK long-press).
+  if (!recentBooks.empty() && selectorIndex < recentBooks.size() &&
+      mappedInput.isPressed(MappedInputManager::Button::Confirm) && mappedInput.getHeldTime() >= LONG_PRESS_MS) {
+    longPressFired = true;
+    promptRemoveBook(recentBooks[selectorIndex].path, recentBooks[selectorIndex].title);
+    return;
+  }
+
   if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
     if (!recentBooks.empty() && selectorIndex < static_cast<int>(recentBooks.size())) {
       LOG_DBG("RBA", "Selected recent book: %s", recentBooks[selectorIndex].path.c_str());
@@ -76,6 +98,29 @@ void RecentBooksActivity::loop() {
   });
 }
 
+void RecentBooksActivity::promptRemoveBook(const std::string& path, const std::string& title) {
+  auto handler = [this, path](const ActivityResult& res) {
+    if (res.isCancelled) {
+      LOG_DBG("RBA", "Remove from recents cancelled");
+      return;
+    }
+    if (RECENT_BOOKS.removeByPath(path)) {
+      LOG_DBG("RBA", "Removed from recents: %s", path.c_str());
+      loadRecentBooks();
+      if (recentBooks.empty()) {
+        selectorIndex = 0;
+      } else if (selectorIndex >= recentBooks.size()) {
+        selectorIndex = recentBooks.size() - 1;
+      }
+      requestUpdate(true);
+    }
+  };
+
+  startActivityForResult(
+      std::make_unique<ConfirmationActivity>(renderer, mappedInput, tr(STR_REMOVE_FROM_RECENTS), title),
+      std::move(handler));
+}
+
 void RecentBooksActivity::render(RenderLock&&) {
   renderer.clearScreen();