Bump to v1.3.0: force JS cache invalidation for clone UX changes

JS files are cache-busted by app version (?v=1.3.0), so browsers that
served stale v1.2.0 scripts will now fetch the updated voice-clone.js,
stt.js, style.css, and nav.js.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -9,6 +9,20 @@ Follows [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) · versioned wi
 
 ---
 
+## [1.3.0] — 2026-05-31
+
+### Added
+- **Live mic monitor in Clone a Voice** — level-meter and scrolling oscilloscope waveform in the Microphone card. "Check level" / "Stop monitor" buttons, mic gain slider. Recording uses raw mic constraints (no echo-cancel / AGC).
+- **STT engine picker in Clone → Transcript** — pick any configured STT backend when auto-transcribing, bypassing an unavailable Whisper.
+- **Better sample texts** — all 8 languages rewritten to ~38 words / ~15 s, phonetically rich, proper Unicode diacritics.
+
+### Fixed
+- **Empty "Read aloud" field** — sample text now reliably populates on load and when navigating to the Clone section.
+- **Recording quality** — `MediaRecorder` requests 256 kbps in Clone and STT→TTS.
+- **OGG file import** — explicit extension list in `accept=`.
+
+---
+
 ## [1.2.0] — 2026-05-29
 
 ### Added

VERSION

@@ -1 +1 @@
-1.2.0
+1.3.0