Support git commit --amend and force-with-lease push as Stream Deck actions

Amending commits and force-with-lease pushes are common actions in my workflow, and I'd like to map them to my Stream Deck.

From what I've found so far:
- `Vcs.ToggleAmendCommitMode` appears to be a toggle rather than a one-shot action, and I couldn't find any other action that performs `git commit --amend`.
- `Git.Commit.And.Push.Executor` doesn't seem to have any effect.

Would it be possible to support these natively, either by exposing the underlying git features or by introducing dedicated actions on the IDE side?

Thanks!

Start by inspecting the existing Vcs.ToggleAmendCommitMode and Git.Commit.And.Push.Executor action integrations mentioned in the issue, then trace how Stream Deck actions are exposed by the plugin. Done means establishing a defined action design and adding support for amend commits and force-with-lease pushes through the IDE integration.

Written by the indexing model from the issue text.