feat: allow volume browsing

[glefer]

Now, users can examine the structure of their Docker volumes, view files, and navigate through directories.

Key changes

To browse the volume contents, a new VolumeBrowserScreen was added to the TUI.
Navigation functionality was implemented:

• Enter: Open the directory you have chosen.
• Backspace: Open the parent directory.

Icons to differentiate between directories and files.
The current path is displayed in a status bar.

How to Use:

Select a volume in the main table.
Press b to browse the selected volume.
Use Enter and Backspace to navigate.

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
src/docker_volume_analyzer
__init__.py	0	0	100%
docker_client.py	36	0	100%
errors.py	3	0	100%
filesystem.py	51	0	100%
main.py	9	0	100%
tui.py	163	0	100%
volume_manager.py	30	0	100%
TOTAL	292	0	100%

[Copilot]

Pull Request Overview

Adds a volume-browsing feature to the TUI, including backend support for retrieving filesystem trees and tests covering the new screens and client methods.

• Introduce get_volume_tree in VolumeManager and get_directory_informations_with_find in DockerClient
• Add VolumeBrowserScreen UI component, CSS rules, and key bindings for browsing
• Expand test suite to cover filesystem parsing, volume manager tree retrieval, Docker client find calls, and TUI navigation

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/docker_volume_analyzer/docker_client.py	Implemented get_directory_informations_with_find to run find in a container
src/docker_volume_analyzer/filesystem.py	Added FileSystem and parse_find_output to build file trees
src/docker_volume_analyzer/volume_manager.py	Added get_volume_tree and imported parse_find_output
src/docker_volume_analyzer/tui.py	Added VolumeBrowserScreen, action_browse, and key handling
src/docker_volume_analyzer/tui.tcss	Extended stylesheet to style file tree and shortcuts
tests/test_volume_manager.py	Tests for get_volume_tree success and empty cases
tests/test_tui.py	Tests for browsing action, screen behavior, and key events
tests/test_filesystem.py	New tests for FileSystem, FileNode, and parse_find_output
tests/test_docker_client.py	Tests for get_directory_informations_with_find cases
.flake8	Added flake8 config

Comments suppressed due to low confidence (5)

src/docker_volume_analyzer/filesystem.py:35

• [nitpick] The attribute name childrens is nonstandard English; consider renaming to children for clarity and consistency.

childrens: Dict[str, "FileNode"] = field(default_factory=dict)

src/docker_volume_analyzer/tui.py:155

• In DockerTUI.action_browse, self.app.push_screen is used but app is not an attribute on the App instance. Replace self.app.push_screen with self.push_screen to correctly push the new screen.

self.app.push_screen(

src/docker_volume_analyzer/volume_manager.py:36

• There's a missing space in the docstring before parse_find_output. It reads andparse_find_output—insert a space for clarity.

dict: Dictionary with volume names as keys andparse_find_output

src/docker_volume_analyzer/tui.tcss:82

• Missing semicolon after the CSS property value. It should be color: $footer-key-foreground; to avoid syntax errors.

color: $footer-key-foreground

src/docker_volume_analyzer/docker_client.py:98

• The return type uses Union[str, None], but Union is not imported. Add from typing import Union at the top of the file.

def get_directory_informations_with_find(