Fix/e reputation calculating display error

[Bekiboo]

Description of change

Fixed "Calculating..." bug - Added getActivityResult() helper that checks for calculatedScore in completed calculations (including 0) and displays "Score: 0/5" instead of "Calculating..."
Refactored icon styling - Created getActivityIconClass() helper to replace long nested ternary expressions in activity icon containers (desktop & mobile views)

Issue Number

Closes #632

Type of change

• Fix (a change which fixes an issue)

How the change has been tested

Change checklist

• I have ensured that the CI Checks pass locally
• I have removed any unnecessary logic
• My code is well documented
• I have signed my commits
• My code follows the pattern of the application
• I have self reviewed my code

[coderabbitai]

Important

Review skipped

Review was skipped as selected files did not have any reviewable changes.

💤 Files selected but had no reviewable changes (1)

• platforms/eReputation/client/src/pages/dashboard.tsx

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