0.1 update, make the stop container code more robust and fix some bugs, update the about screen for version 0.1

DEVLOG.md

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+# Tux-Dock Development Log
+
+## 0.1-beta
+
+This release establishes the first beta-quality Docker integration and TUI workflow.
+
+### Docker integration
+
+- Added direct Docker Engine API access through `/var/run/docker.sock`.
+- Added startup Docker preflight using `GET /_ping` before launching the TUI.
+- Added synchronous initial container and image loading.
+- Added asynchronous cache refreshes after mutations and interactive sessions.
+- Preserved cached state when a refresh fails.
+- Added structured container/image JSON mapping with exited-container support.
+
+### Process execution
+
+- Replaced `system()` and `popen()` with a `fork`/`exec` process runner.
+- Added captured stdout/stderr and inherited terminal I/O modes.
+- Kept direct CLI execution for interactive terminal handoffs.
+
+### Reliability
+
+- Added HTTP response parsing for Content-Length, chunked transfer, and bodyless responses.
+- Added robust handling for Docker `204` and idempotent `304` responses.
+- Added tri-state stop polling: stopped, running, and unknown.
+- Added bounded stop retries after transport timeouts.
+- Stop completion now refreshes cached state before showing the result modal.
+
+### TUI
+
+- Replaced the persistent status panel with a centered actions panel.
+- Added busy-operation modals with spinner feedback.
+- Blocked input during long-running Docker operations.
+- Added structured, scrollable container and image list dialogs.
+
+### Tests
+
+- Added HTTP response parser tests.
+- Added container JSON mapping tests.
+- Added operation-state tests.
+- Added stop polling and timeout-sequence regression tests.