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4ba130ccfa
SPIFFS.begin(true) auto-formats on mount failure, but the auto-format
itself can fail if the partition contains residual data from a previous
firmware (e.g. stock LilyGo, Meshtastic, or MeshCore with a different
partition layout). When that happens the firmware previously printed
"SPIFFS format FAILED!" and continued in a broken state with no
persistence.
Now on auto-format failure:
1. Find the SPIFFS partition via esp_partition_find_first()
2. Erase it completely with esp_partition_erase_range()
3. Call SPIFFS.format() + SPIFFS.begin(false) with up to 3 retries
Added #include <esp_partition.h> under ESP32 guard.
The existing first-boot display feedback ("Formatting storage...
First boot - please wait") is unchanged -- it fires on the initial
mount failure. The new partition erase code only triggers if the
auto-format also fails.