feat: improve medication detail modal layout and display (#258)

Widen detail modal on desktop (711px, up from 500px) with max-width
override to beat modals-base.css specificity. Limit fullscreen mode
to actual phones (<=500px) instead of all screens <=900px. Move intake
schedule section before prescription details. Show per-intake takenBy
person and bell icon with proper warning color. Right-align time in
schedule rows. Move notes icon after label text. Replace emoji bell
icons with Lucide Bell component in SchedulePage and MobileEditModal.
Add common.on/common.off i18n keys.

Closes #254

frontend/src/pages/SchedulePage.tsx

@@ -1,3 +1,4 @@
+import { Bell } from "lucide-react";
 import { useTranslation } from "react-i18next";
 import { MedicationAvatar } from "../components";
 import { useAuth } from "../components/Auth";
@@ -204,7 +205,7 @@ export function SchedulePage() {
 																			className="reminder-icon info-tooltip"
 																			data-tooltip={t("tooltips.intakeReminders")}
 																		>
-																			🔔
+																			<Bell size={14} aria-hidden="true" />
 																		</span>
 																	)}{" "}
 																	<div className="dose-checks">
@@ -365,7 +366,7 @@ export function SchedulePage() {
 																	className="reminder-icon info-tooltip"
 																	data-tooltip={t("tooltips.intakeReminders")}
 																>
-																	🔔
+																	<Bell size={14} aria-hidden="true" />
 																</span>
 															)}
 															<div className="dose-checks">