Snapshot Beep + WAV UI before Pomodoro rewrite.

Keep LEDC tones, TF WAV playback, and compact list layout as a tagged baseline.

Co-authored-by: Cursor <cursoragent@cursor.com>

CHANGELOG.md

@@ -1,5 +1,46 @@
 # Changelog
 
+## 2026-10-18 — WAV via DAC2 only (touch-safe)
+
+- Drop I2S INTERNAL_DAC (it enables GPIO25 and kills touch).
+- PCM WAV → RAM → dac_output on GPIO26 only; Beep tab unchanged.
+
+## 2026-10-18 — Beep tab + WAV tab
+
+- Keep 16 LEDC beeps on Beep tab.
+- WAV tab scans TF (/ and /wav); short files load to RAM then play via Internal DAC.
+- Core0 decode task; gain capped for onboard amp.
+
+## 2026-10-18 — Built-in UI beep sounds
+
+- Drop MP3; LEDC tone bank: Click/Key/Pop/Confirm/Cancel/Success/Error/...
+- Scrollable SOUNDS list; tap to play.
+
+## 2026-10-18 — Smooth MP3 + keep UI alive
+
+- MP3 decode on FreeRTOS core0; UI/touch on core1.
+- DAC1(GPIO25) disabled while playing so touch CLK works.
+- No SD rescan during playback (SPI contention).
+
+## 2026-10-18 — Music list from TF
+
+- Scan root + /music for .mp3; scrollable list; tap row to play.
+- PLAY uses selected track; auto-enables speaker on list tap.
+
+## 2026-10-18 — Play /paomo.mp3 from TF
+
+- PLAY streams `/paomo.mp3` via ESP8266Audio + internal DAC (GPIO26).
+- Serial `#PUT` + `tools/sd_put.py` to copy MP3 onto the TF card.
+
+## 2026-10-18 — Canon in D melody
+
+- Replace Twinkle Twinkle with Pachelbel Canon in D (monophonic).
+
+## 2026-10-17 — ASCII glyphs + volume slider
+
+- Replace ·/— (tofu boxes) with ASCII `-` / `|`.
+- Add VOL slider (0-100); live duty update while playing.
+
 ## 2026-10-17 — UI layout refresh
 
 - Compact 320x240 layout: header status, capacity hero, usage bar, dual actions.