T hoguet/issue16 (#61)

* feat: enhance loading spinner with progress indication and add warning for unplaced vacation days

* feat: upgrade Angular dependencies to version 21 and implement new animation features

- Updated Angular dependencies in package.json to version 21.x.x.
- Added `provideAnimationsAsync` to app configuration for improved animation handling.
- Refactored user input component to utilize a dynamic list of vacation days with animations.
- Introduced a new `DayInput` component for managing individual vacation days.
- Enhanced styling and animations for user input and day input components.
- Updated calendar service to support new vacation day structure.
- Adjusted tests to accommodate changes in component structure and dependencies.

* feat: enhance vacation optimization logic and UI components

* Fix signal immutability violations and cleanup unused code (#62)

* Initial plan

* fix: address PR review comments for signal immutability and cleanup

Co-authored-by: THoguet <61246905+THoguet@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: THoguet <61246905+THoguet@users.noreply.github.com>

* fix: add --legacy-peer-deps for Angular 21 compatibility (#63)

* Initial plan

* fix: add --legacy-peer-deps to npm ci for Angular 21 compatibility

Co-authored-by: THoguet <61246905+THoguet@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: THoguet <61246905+THoguet@users.noreply.github.com>

* Fix unit tests for VacDay[] type migration (#64)

* Initial plan

* fix: update unit tests to match VacDay[] type structure

Co-authored-by: THoguet <61246905+THoguet@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: THoguet <61246905+THoguet@users.noreply.github.com>

---------

Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>

src/app/components/userInput/day-input/day-input.scss

@@ -0,0 +1,21 @@
+.card {
+	display: flex;
+	flex-direction: row;
+	align-items: center;
+	justify-content: space-between;
+	padding: 16px;
+	gap: 16px;
+	flex-wrap: wrap;
+}
+
+.dateInput {
+	flex-grow: 1;
+}
+
+.numberInput {
+	width: 80px;
+}
+
+::ng-deep .mat-mdc-form-field-subscript-wrapper {
+	display: none;
+}