rm-hull / git-commit-summary / 26337754780

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feat: implement Ctrl+X to cut lines in commit view (#39)

* feat: implement Ctrl+X to cut lines in commit view

Adds a keyboard shortcut (`Ctrl+X`) to the commit view that cuts the
current line and copies it to the system clipboard.

- Integrates `github.com/atotto/clipboard` for system access.
- Removes the active line from the textarea buffer.
- Records the change in the history buffer for undo support.
- Recalculates the cursor offset to maintain focus on the following
  line.

```mermaid
graph TD
    A[Press Ctrl+X] --> B{Textarea empty?}
    B -- No --> C[Identify current line]
    C --> D[Copy line to clipboard]
    D --> E[Remove line from buffer]
    E --> F[Push state to history]
    F --> G[Update cursor position]
    B -- Yes --> H[Ignore]
```

* chore: update dependencies in go.mod

- Remove unused `github.com/atotto/clipboard`.
- Update `charmbracelet/x/exp/slice` to latest patch.
- Update `genproto/googleapis/rpc` to latest patch.

* fix: improve line cut functionality in commit view

- Ensure the textarea is focused before performing a cut.
- Include newline characters when copying lines to the clipboard.
- Handle potential clipboard write errors.
- Correctly restore the cursor position after removing a line.

* refactor: simplify commit view navigation logic

- Remove redundant textarea focus calls.
- Fix index out-of-bounds check when committing an empty or single-line
  message.

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