fix: frontend UI polish — tooltips, planner checkbox, settings layout (#228)

- Fix mobile tooltip positioning (above icon instead of centered)
- Place planner checkbox and send-now button on same row
- Move settings tooltips beside input fields instead of overlapping
- Fix input-with-tooltip layout for narrow screens
- Add daily/everyNDays i18n keys for dose frequency display
- Fix lint formatting in page components

Closes #225

frontend/src/components/MedDetailModal.tsx

@@ -356,8 +356,7 @@ export function MedDetailModal({
 													` (${totalUsage * selectedMed.pillWeightMg} ${selectedMed.doseUnit ?? "mg"})`}
 											</span>
 											<span className="med-schedule-freq">
-												{t("form.blisters.every")} {blister.every}{" "}
-												{blister.every !== 1 ? t("common.days") : t("common.day")}
+												{blister.every === 1 ? t("common.daily") : t("common.everyNDays", { count: blister.every })}
 											</span>
 											<span className="med-schedule-time">
 												{t("modal.at")}{" "}