docs: update CHANGELOG with v0.8.0 bug fixes and release infra

Author: chenyc21

CHANGELOG.md

@@ -11,6 +11,18 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/), and this
 - Undo delete: deleted files are moved to a temporary directory and can be restored with `u` key (`commands.go`, `handlers.go`)
 - Undo rename: renamed files can be restored to their original name with `u` key (`commands.go`)
 - Undo stack: tracks last 10 operations, automatically cleans up on program exit (`commands.go`, `main.go`)
+- Batch undo: deleting multiple files creates one undo entry, `u` restores all at once (`handlers.go`, `commands.go`)
+- `moveFile` helper: cross-device file move with copy+delete fallback, used by delete/undo/paste (`commands.go`)
+- GoReleaser config for automated multi-platform releases (`.goreleaser.yaml`)
+- winget manifest template for Windows Package Manager (`winget/`)
+- CI now tests on Windows (`windows-latest`) in addition to Linux
+
+### Fixed
+
+- Cross-drive delete/undo on Windows: `os.Rename` across volumes (C:\ ↔ D:\) now falls back to copy+delete (`commands.go`)
+- Data race in undo: undoStack mutations moved from tea.Cmd goroutine to main Update handler (`app.go`, `handlers.go`, `commands.go`)
+- `IsDir` always false in delete: stat is now performed before file is moved (`handlers.go`)
+- `doPaste` now reuses `moveFile` for cross-device consistency (`commands.go`)
 
 ## [0.7.0] - 2026-08-04