feat: simplify main path in goreleaser config

The main path in the goreleaser configuration was simplified
by removing the redundant './cmd/' prefix. This change
makes the configuration cleaner and easier to read, without
affecting the build process.

chore: rename cmd/main.go to main.go

The main.go file was moved to the root directory
to simplify the project structure. The 'cmd'
directory is no longer necessary as the project
has a single entry point.

fix(render): handle empty XDG_CURRENT_DESKTOP environment variable

Adjusts the retrieval of the desktop environment variable to handle
cases where it might be empty. Sets a default value of "não reconhecido"
when the "XDG_CURRENT_DESKTOP" environment variable is not set. This
ensures that the application does not encounter unexpected behavior
when the environment variable is missing.

fix: update ldflags path in .goreleaser.yml

Corrects the ldflags path in the .goreleaser.yml file to ensure
the version information is correctly embedded in the binary.
This change addresses an issue where the version was not being
set properly due to an incorrect package path.

feat: update color scheme for improved UI consistency

The color scheme has been updated to enhance UI consistency. The
FocusedButton background color is changed from SunflowerYellow to
AmberFlare. Additionally, the constant ForestGreen is renamed to
Forest, and a new color AmberFlare is introduced. These changes
ensure a more cohesive and visually appealing interface.

refactor(model): add dbus connection for notifications

feat: update .goreleaser.yml to support multiple OS builds

Enhances the build configuration to support Windows, Linux, and Darwin
platforms. Adds specific build IDs for Windows and Linux-Darwin with
appropriate OS and architecture settings. This change allows for more
flexible and targeted releases across different operating systems.

fix: correct ldflags syntax in .goreleaser.yml

Corrects the syntax for the ldflags in the .goreleaser.yml file by
changing '-H windowsgui' to '-H=windowsgui'. This change ensures
proper parsing and execution of the build command, preventing
potential errors during the release process.

feat: add desktop notification feature to README

Added a section in the README to describe the new desktop
notification feature for Linux. This feature provides reminders
to help users keep their time tracking up to date, enhancing
the usability and functionality of the application.

feat: update key bindings and improve UI responsiveness

Updated key bindings in the README to include new shortcuts for
exiting and retrying actions. Enhanced the UI to handle terminal
window size changes, ensuring proper display even in smaller
windows. Adjusted default dimensions and bar chart colors for
better visual representation. These changes improve user
interaction by providing more intuitive controls and ensuring
the application remains functional across different terminal
sizes.