feat: redesign day picker with expandable calendar, status markers & Playwright E2E testing

- Replace modal calendar with inline expandable calendar widget integrated into the day picker.
- Add status indicator dots (attended/absent/pending) to month calendar grid matching day picker.
- Disable and gray out weekend days in calendar when weekend schedule is turned off.
- Redesign extend bar with integrated handle that aligns with the palette.
- Remove start-to-end timing on Today screen's class time rail, showing only start time.
- Implement Playwright E2E and visual testing suite with multi-screen capture scripts.
- Add cascade DELETE endpoints for subjects and versioned recurring timetable entries.

package-lock.json

@@ -37,9 +37,11 @@
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@@ -2423,6 +2425,22 @@
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@@ -9527,6 +9545,53 @@
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+      "hasInstallScript": true,
+      "license": "MIT",
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+      "os": [
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     "node_modules/plist": {
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