fix: WDS, increase perceived darkness of modal overlay

[ichik]

Description

Closes #33276
By far the biggest impact on perceived darkness is dependent on transparency, adjusted it in light mode too just a little bit.

Automation

/ok-to-test tags="@tag.Anvil"

🔍 Cypress test results

Tip

🟢 🟢 🟢 All cypress tests have passed! 🎉 🎉 🎉
Workflow run: https://github.com/appsmithorg/appsmith/actions/runs/9092935034
Commit: d135655
Cypress dashboard url: Click here!

Communication

Should the DevRel and Marketing teams inform users about this change?

• Yes
• No

[coderabbitai]

Walkthrough

Walkthrough

The recent changes in the theming files for both dark and light modes focus on adjusting the alpha transparency and lightness values of colors. These modifications aim to enhance the visual contrast and user experience, particularly for modal overlays. The dark mode theme now has a darker modal overlay, while the light mode theme features a slightly more opaque overlay.

Changes

File	Change Summary
.../DarkModeTheme.ts .../LightModeTheme.ts	Increased color alpha value from 0.5 to 0.7 in DarkModeTheme and from 0.5 to 0.6 in LightModeTheme. Adjusted lightness condition threshold from > 0.15 to > 0.12 in DarkModeTheme.

Assessment against linked issues

Objective	Addressed	Explanation
Modal overlay on dark theme needs to be darker (#33276)	✅

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Recent Review Details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between d135655 and b724bef.

Files selected for processing (2)

• app/client/packages/design-system/theming/src/color/tests/DarkModeTheme.test.ts (1 hunks)
• app/client/packages/design-system/theming/src/color/tests/LightModeTheme.test.ts (1 hunks)

Files skipped from review due to trivial changes (2)

• app/client/packages/design-system/theming/src/color/tests/DarkModeTheme.test.ts
• app/client/packages/design-system/theming/src/color/tests/LightModeTheme.test.ts

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