fix: add credentials to all fetch calls for auth cookie support (#72)

* fix: add credentials to all fetch calls for auth cookie support

- Add credentials: include to useMedications.ts fetch calls
- Add credentials: include to MedicationsPage.tsx save function
- Add credentials: include to useSettings.ts settings update
- Add credentials: include to useShare.ts share generation
- Add credentials: include to DashboardPage.tsx reminder email
- Add credentials: include to PlannerPage.tsx usage calculation
- Make create-release workflow skip if release already exists

* fix: default to ntfy-style notifications for HTTP URLs

- Change notification logic to use plain text format by default
- Only use JSON format for known webhook services (Discord, Slack, Telegram, Gotify)
- This fixes ntfy URLs not being recognized when hostname doesn't contain 'ntfy'

* feat: highlight medication being edited

- Add blue border and background to the medication row being edited
- Show medication avatar and name in the edit form header
- Makes it easy to identify which medication is being edited when there are many

* fix: use proper URL parsing for webhook detection (CodeQL security fix)

Replace vulnerable .includes() URL checks with proper URL hostname
parsing to prevent bypass attacks (e.g., evil.com?hooks.slack.com).

Fixes CodeQL alerts #33 and #34 (js/incomplete-url-substring-sanitization)

frontend/src/styles.css

@@ -387,6 +387,19 @@ body.modal-open {
 	color: var(--accent-light);
 }
 
+.edit-header {
+	display: flex;
+	align-items: center;
+	gap: 0.75rem;
+}
+.edit-header h2 {
+	margin: 0;
+	font-size: 1.1rem;
+	white-space: nowrap;
+	overflow: hidden;
+	text-overflow: ellipsis;
+}
+
 .schedule-full {
 	max-width: 100%;
 }
@@ -468,6 +481,11 @@ body.modal-open {
 		background 200ms ease,
 		border-color 200ms ease;
 }
+.med-row.editing {
+	border-color: var(--accent);
+	background: color-mix(in srgb, var(--accent) 8%, var(--bg-tertiary));
+	box-shadow: 0 0 0 1px var(--accent);
+}
 .med-header {
 	display: flex;
 	justify-content: space-between;