feat: New Theme Structure and Custom Style Integration

[kanikabansal-juspay]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

• Added types for the new themes structure to append the custom style object to the DOM, enabling compatibility with Tailwind and UI configuration.
• Updated corresponding style definitions to align with the new structure.
• Introduced a feature flag (themes-feature) to toggle support for the new themes. When enabled, styles are fetched dynamically from the API. For this PR it'll be always false to support existing structure.
• Modified the primary secondary colors sidebar styles, background, typography (text color), border, and button states (primary, secondary, hover, and text) as an initial update.

Motivation and Context

To support themes.

• Turned on themes-feature by setting it to true.
• Added a sample JSON theme structure in fetchConfig (in HyperSwitchEntry.res).
• Checked the dashboard to see if the changes showed up as expected.

Where to test it?

• INTEG
• SANDBOX
• PROD

Checklist

• I ran npm run re:build
• I reviewed submitted code
• I added unit tests for my changes where possible

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
public/hyperswitch/module.js	16% smaller
tailwind.config.js	8% smaller
config/config.toml	Unsupported file format
src/UIConifg/UIConfig.res	Unsupported file format
src/components/Button.res	Unsupported file format
src/context/ThemeProvider.res	Unsupported file format
src/entryPoints/AuthModule/AuthWrapper.res	Unsupported file format
src/entryPoints/AuthModule/PreLoginModule/AuthSelect.res	Unsupported file format
src/entryPoints/AuthModule/PreLoginModule/ResetPassword.res	Unsupported file format
src/entryPoints/FeatureFlagUtils.res	Unsupported file format
src/entryPoints/HyperSwitchApp.res	Unsupported file format
src/entryPoints/HyperSwitchEntry.res	Unsupported file format
src/entryPoints/configs/HyperSwitchConfigTypes.res	Unsupported file format
src/entryPoints/configs/HyperSwitchDefaultConfig.res	Unsupported file format
src/libraries/Window.res	Unsupported file format
src/screens/Sidebar/Sidebar.res	Unsupported file format