port: upstream PR #1342 - Book Info screen, richer metadata, safer controls

Ports upstream PR #1342 (feat: Add Book Info screen, richer metadata,
and safer file-browser controls) with mod-specific adaptations:

- Parse and cache series, seriesIndex, description from EPUB OPF
- Bump book.bin cache version to 6 for new metadata fields
- Add BookInfoActivity (new screen) accessible via Right button in FileBrowser
- Add ManageBook menu via Left button in FileBrowser (replaces upstream hidden delete)
- Guard all delete/archive actions with ConfirmationActivity (10 call sites)
- Add inputArmed gating to ConfirmationActivity to prevent accidental confirmation
- Safe deserialization: readString now returns bool with MAX_STRING_LENGTH guard
- Add series field to RecentBooksStore with JSON and binary serialization
- Add i18n keys: STR_BOOK_INFO, STR_AUTHOR, STR_SERIES, STR_FILE_SIZE, etc.

Made-with: Cursor

src/WifiCredentialStore.cpp

@@ -81,7 +81,10 @@ bool WifiCredentialStore::loadFromBinaryFile() {
   }
 
   if (version >= 2) {
-    serialization::readString(file, lastConnectedSsid);
+    if (!serialization::readString(file, lastConnectedSsid)) {
+      file.close();
+      return false;
+    }
   } else {
     lastConnectedSsid.clear();
   }
@@ -92,8 +95,7 @@ bool WifiCredentialStore::loadFromBinaryFile() {
   credentials.clear();
   for (uint8_t i = 0; i < count && i < MAX_NETWORKS; i++) {
     WifiCredential cred;
-    serialization::readString(file, cred.ssid);
-    serialization::readString(file, cred.password);
+    if (!serialization::readString(file, cred.ssid) || !serialization::readString(file, cred.password)) break;
     legacyDeobfuscate(cred.password);
     credentials.push_back(cred);
   }