Show motivational quote when sob emoji selected

[Copilot]

When users select the sob emoji (😭) for their mood, display a random encouraging message via snackbar.

Changes

• MotivationalQuotes.cs: Static utility with 30 motivational quotes and random selection
• DataPointView.razor: Inject ISnackbar, add OnMoodSelected() handler that triggers snackbar for sob emoji
• DataPointViewTests.razor: Test coverage verifying snackbar appears

Implementation

void OnMoodSelected(string mood)
{
    Point.Mood = mood;
    
    if (mood == DataPoint.Moods[^1])  // Sob emoji is last in list
    {
        var quote = MotivationalQuotes.GetRandomQuote();
        Snackbar.Add(quote, Severity.Info, c => c.Icon = Icons.Material.Rounded.FavoriteBorder);
    }
}

Uses DataPoint.Moods[^1] reference instead of hardcoded emoji string for maintainability.

The quote collection includes 30 diverse, encouraging messages covering themes of resilience, self-compassion, healing, and taking things one step at a time.

Original prompt

Show a random motivational quote in a snackbar when the user picks the sob emoji

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[danielchalmers]

@copilot add more quotes

[Copilot]

@copilot add more quotes

Added 20 more motivational quotes, bringing the total from 10 to 30 encouraging messages. The new quotes include themes of resilience, self-compassion, healing, and taking things one step at a time. (408a94e)