app theme for zplit

[4555jan]

Addressed Issues:

Fixes #50

Screenshots/Recordings:

No UI changes — this PR adds theme configuration files only.

Additional Notes:

Added app color palette and text styles for the Zplit app theme, including light and dark mode colors, typography

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[DecodeX15]

fix this typo app_text_Styles to app_text_styles

[DecodeX15]

rest LGTM

[M4dhav]

Use ThemeData class to create a theme instead of defining colors like this.

[M4dhav]

We don't need app_colors.dart or app_text_styles.dart as app_theme is importing these variables. Just define the colors and Styles in the Theme directly.

[4555jan]

@M4dhav what you think now ?