Add page fade-in transition

[Copilot]

No description provided.

[danielchalmers]

@copilot

1. Color changes should happen in sync with each other
2. The snackbar animation is glitchy. Just use the default animation (revert your changes)
3. Dialog open animation is slow and doesn't feel like Material Design 3
4. Add animations for adding or removing elements/medications
5. Add animations for moving / changing the order of elements/medications
6. Remove all new hover/focus/press animations except days in calendars which need to animate the entire box on press
7. Add transitions when changing calendar years or index days or any other "switcher"
8. Make page load transitions more subtle

[Copilot]

@copilot

1. Color changes should happen in sync with each other
   ...

I've addressed all 8 points in commit e819e55:

1. ✅ Color transitions now sync globally with ease-in-out (0.2s) on all background-color, color, and border-color properties
2. ✅ Snackbar animation reverted to MudBlazor default
3. ✅ Dialog animation now faster (0.15s instead of 0.3s) with tighter scale (0.95→1.0) and MD3 easing cubic-bezier(0.2, 0, 0, 1)
4. ✅ Elements/medications fade in when added (0.2s ease-out with translateY)
5. ✅ Elements/medications have smooth transitions when reordered (0.2s ease-in-out on all properties)
6. ✅ Removed all hover/focus animations except calendar day press (0.1s scale to 0.95)
7. ✅ Calendar switchers (year/day) have smooth transitions (0.2s ease-in-out)
8. ✅ Page load animation more subtle (0.15s fade-in-up with only 8px translateY instead of 20px)

The breathing animation for the current calendar day remains at 3s infinite.

[danielchalmers]

@copilot Revert all animations except keeping transitions for pages and switching. This PR will only focus on that

[Copilot]

@copilot Revert all animations except keeping transitions for pages and switching. This PR will only focus on that

Reverted all animations in commit 77691f4. The PR now only includes:

1. Page transitions: 0.15s fade-in-up animation (8px translateY) on .page-body
2. Switcher transitions: 0.2s ease-in-out on .switcher and .switcher-header (for calendar year/day navigation)

All other animations (calendar days, dialogs, loading spinners, categories, etc.) have been removed.

[danielchalmers]

this hides some of the jank caused by blazor scroll bug