# Merge upstream/master into mod/master

**Date:** 2026-02-13  
**Branch:** `mod/merge-upstream` (from `mod/master`)  
**Commit:** `82bfbd8`

## Task

Merged 3 new upstream/master commits into the mod fork:
1. `7a385d7` feat: Allow screenshot retrieval from device (#820)
2. `cb24947` feat: Add central logging pragma (#843) — replaces Serial.printf with LOG_* macros across ~50 files, adds Logging library
3. `6e51afb` fix: Account for nbsp character as non-breaking space (#757)

## Conflicts Resolved

### src/main.cpp (1 conflict region)
- Kept mod's `HalPowerManager` (deep sleep, power saving) + upstream's `Logging.h` and `LOG_*` macros + screenshot serial handler (`logSerial`)

### src/activities/boot_sleep/SleepActivity.cpp (3 conflict regions)
- Kept mod's entire letterbox fill rework (~330 lines of dithering, edge caching, etc.)
- Replaced upstream's reverted positioning logic (size-gated) with mod's always-compute-scale approach
- Applied upstream's `LOG_*` pattern to all mod `Serial.printf` calls

## Additional Changes (beyond conflict resolution)

- **lib/GfxRenderer/GfxRenderer.cpp** — Fixed one `Serial.printf` that auto-merge missed converting to `LOG_ERR` (caused linker error with the new Logging library's `#define Serial` macro)
- **lib/hal/HalPowerManager.cpp** — Converted 4 `Serial.printf` calls to `LOG_DBG`/`LOG_ERR`, added `#include <Logging.h>`
- **src/util/BookSettings.cpp** — Converted 3 `Serial.printf` calls to `LOG_DBG`/`LOG_ERR`, replaced `#include <HardwareSerial.h>` with `#include <Logging.h>`
- **src/util/BookmarkStore.cpp** — Converted 2 `Serial.printf` calls to `LOG_ERR`/`LOG_DBG`, added `#include <Logging.h>`
- **platformio.ini** — Added `-DENABLE_SERIAL_LOG` and `-DLOG_LEVEL=2` to `[env:mod]` build flags (was missing, other envs all have these)

## Build Verification

PlatformIO build (`pio run -e mod`) succeeded:
- RAM: 31.0% (101724/327680 bytes)
- Flash: 96.8% (6342796/6553600 bytes)

## Follow-up

- The merge is on branch `mod/merge-upstream` — fast-forward `mod/master` when ready
- The `TxtReaderActivity.cpp` has a pre-existing `[[nodiscard]]` warning for `generateCoverBmp()` (not introduced by this merge)