Refactor cryptic variable names to descriptive identifiers

[Copilot]

Replaced single-letter and abbreviated variable names with descriptive identifiers across the Activities system to improve code readability and maintainability.

Changes

ActivityTimer.cs

• ms → milliseconds, tfTime → timeTextField, coTimer → timerCoroutine

DraggableTile.cs

• manager → activityManager, activityTranform → activityTransform (typo fix)
• Lambda parameters: ci/dt → cardInfo/draggableTile

ActivityOrder.cs

• Type casting: csd → orderSettings
• UI components: img → ghostImage, c → color
• Coordinates: t/p/pos → elapsedTime/progress/position
• Transforms: rt → rectTransform, go → tileGameObject

ActivityMatch.cs (most extensive)

• Dimensions: w/h/n → width/height/count
• Components: rt/qi/ai → rectTransform/questionItem/answerItem
• Collections: pa/ds → poolArea/dropSlot
• Coordinates: t/x/y/pos → interpolationFactor/xPosition/yPosition/position

Example

Before:

var rt = BoardArea as RectTransform;
float w = rt.rect.width;
float h = rt.rect.height;
int n = questionItems.Count;
for (int i = 0; i < n; i++) {
    var qi = questionItems[i];
    var t = (n == 1) ? 0.5f : (float)i / (n - 1);
    float x = Mathf.Lerp(-w * 0.5f, w * 0.5f, t);
}

After:

var rootRectTransform = BoardArea as RectTransform;
float width = rootRectTransform.rect.width;
float height = rootRectTransform.rect.height;
int count = questionItems.Count;
for (int i = 0; i < count; i++) {
    var questionItem = questionItems[i];
    var interpolationFactor = (count == 1) ? 0.5f : (float)i / (count - 1);
    float xPosition = Mathf.Lerp(-width * 0.5f, width * 0.5f, interpolationFactor);
}

201 lines refactored across 4 files. Loop counters (i, j) preserved per .NET conventions.

Original prompt

Suggest more descriptive variable and function names

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[StefanoCecere]

tfTime is textfieldTime, no timeTextField .. tf is the acronym of textfield