Add selective file staging to commit dialog

[GuilhermeVieiraDev]

What Changed

Added checkboxes to the commit dialog file list so users can include/exclude specific files from a commit.

• Each file row now has a checkbox; unchecking a file excludes it from staging
• A select-all/none header checkbox toggles all files at once
• Totals update to reflect only selected files
• Commit buttons are disabled when no files are selected
• When all files are checked, existing git add -A behavior is preserved
• When some files are unchecked, only selected paths are staged via git add -A -- <paths>

Why

The commit flow currently stages all working tree changes with no way to exclude specific files. This is a common need when working across multiple files but only wanting to commit a subset.

UI Changes

Before:

After:

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add selective file staging to commit dialog

• Adds per-file checkboxes to the commit dialog in GitActionsControl.tsx, including a 'select all' toggle; commit buttons are disabled when no files are selected.
• Extends GitCore.prepareCommitContext to accept an optional filePaths array; when provided, it runs git reset then git add -A -- <filePaths> instead of staging all changes.
• Propagates filePaths through GitManager.runStackedAction, runCommitStep, runFeatureBranchStep, and resolveCommitAndBranchSuggestion so commit/branch suggestions and the final commit reflect only the selected files.
• Adds filePaths to the GitRunStackedActionInput contract schema as an optional non-empty array of trimmed strings, and forwards it through the React Query mutation.
• Behavioral Change: when filePaths is provided, a git reset is run before selective staging, which unstages any previously staged changes outside the selection.

^{Macroscope summarized 1174bc1.}

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