feat(hunks)!: highlight inline overlay diffs

BREAKING CHANGE: rename :GitDiffOverlay to :GitHunkOverlay and <Plug>(git-diff-overlay) to <Plug>(git-hunk-overlay).

README.md

@@ -7,7 +7,7 @@ Features:
 - Status sidebar with stage/unstage/discard actions
 - Log viewer
 - Diff splits against any revision, the index, or the worktree
-- Gutter signs + optional diff overlay
+- Gutter signs + optional hunk overlay
 - Per-hunk stage / reset / preview / select
 - Blame: cursor-line popup, inline annotation, full-file gutter
 - Commit proxy (compose in a Neovim buffer)
@@ -36,7 +36,7 @@ vim.pack.add({ "https://git.owall.se/oscar/git.nvim" })
 | `:Gdiffsplit [vertical\|horizontal] [<rev>]` | Open a diff split (default vertical, vs index) |
 | `:Gedit <rev>[:path]`                        | Open an object as a buffer (`git://` URI)      |
 | `:Gstatus [sidebar\|split\|current]`         | Open the status view (default `split`)         |
-| `:GitDiffOverlay`                            | Toggle the in-buffer diff overlay              |
+| `:GitHunkOverlay`                            | Toggle the in-buffer hunk overlay              |
 
 ## Mappings
 
@@ -55,7 +55,7 @@ vim.pack.add({ "https://git.owall.se/oscar/git.nvim" })
 | `<Plug>(git-hunk-select)`               | Visually select the hunk under cursor |
 | `<Plug>(git-hunk-stage-toggle)`         | Stage / unstage hunk or visual hunks  |
 | `<Plug>(git-hunk-reset)`                | Reset hunk                            |
-| `<Plug>(git-hunk-overlay-toggle)`       | Toggle the in-buffer diff overlay     |
+| `<Plug>(git-hunk-overlay)`              | Toggle the in-buffer hunk overlay     |
 | `<Plug>(git-hunk-next)`                 | Jump to next hunk                     |
 | `<Plug>(git-hunk-prev)`                 | Jump to previous hunk                 |