fix(a11y): 44px tap targets + focus-visible on rec-feedback, chart range tabs, export switch (H1/H2/H6/H7)

WCAG 2.5.5 minimum hit-area is 44×44 CSS px and the Wave-C polish set
that as the project floor. Several v1.4.16 surfaces missed it:

- Recommendation thumbs (h-7 = 28 px) — `<RecommendationFeedback>` up
  + down both bumped to `min-h-11 min-w-11` with focus-visible ring.
- Recommendation chevron expand toggle (~24 px, no focus state) —
  `<RecommendationCard>` rec-expand-toggle bumped to `min-h-11
  min-w-11` with focus-visible ring.
- Chart range tabs (7d/30d/90d/All) — `min-h-9 px-2.5` ≈ 36×28 px on
  Pixel 5; bumped to `min-h-11 px-3` across HealthChart, MoodChart,
  MedicationComplianceChart, ComplianceCharts, ComplianceLineChart.
- Medication CSV "include intake history" raw `<input
  type="checkbox">` (16×16, system-blue on iOS Safari) — replaced
  with shadcn `<Switch>` inside a `min-h-11` label so the row is
  properly tappable and visually consistent with every other
  settings toggle.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/insights/recommendation-card.tsx

@@ -369,7 +369,7 @@ export function RecommendationCard({
               type="button"
               onClick={() => setExpanded((v) => !v)}
               aria-expanded={expanded}
-              className="text-muted-foreground hover:text-foreground rounded-md p-1 transition-colors"
+              className="text-muted-foreground hover:text-foreground focus-visible:ring-ring/50 inline-flex min-h-11 min-w-11 items-center justify-center rounded-md transition-colors focus-visible:ring-2 focus-visible:ring-offset-2 focus-visible:outline-none"
               title={
                 expanded
                   ? t("insights.recommendation.rationaleCollapse")

src/components/insights/recommendation-feedback.tsx

@@ -265,7 +265,7 @@ export function RecommendationFeedback({
         title={t("insights.recommendation.feedbackHelpful")}
         disabled={disabled}
         onClick={() => submit(true)}
-        className="text-muted-foreground hover:text-dracula-green disabled:hover:text-muted-foreground inline-flex h-7 w-7 items-center justify-center rounded-md transition-colors disabled:opacity-60"
+        className="text-muted-foreground hover:text-dracula-green disabled:hover:text-muted-foreground focus-visible:ring-ring/50 inline-flex min-h-11 min-w-11 items-center justify-center rounded-md transition-colors focus-visible:ring-2 focus-visible:ring-offset-2 focus-visible:outline-none disabled:opacity-60"
       >
         {submittingUp ? (
           <Loader2 className="h-3.5 w-3.5 animate-spin" aria-hidden="true" />
@@ -280,7 +280,7 @@ export function RecommendationFeedback({
         title={t("insights.recommendation.feedbackNotHelpful")}
         disabled={disabled}
         onClick={() => submit(false)}
-        className="text-muted-foreground hover:text-dracula-orange disabled:hover:text-muted-foreground inline-flex h-7 w-7 items-center justify-center rounded-md transition-colors disabled:opacity-60"
+        className="text-muted-foreground hover:text-dracula-orange disabled:hover:text-muted-foreground focus-visible:ring-ring/50 inline-flex min-h-11 min-w-11 items-center justify-center rounded-md transition-colors focus-visible:ring-2 focus-visible:ring-offset-2 focus-visible:outline-none disabled:opacity-60"
       >
         {submittingDown ? (
           <Loader2 className="h-3.5 w-3.5 animate-spin" aria-hidden="true" />