fix(ui): open hint content on a tap instead of a hover

Seven places kept information in a hover tooltip, which never opens on
a phone: the measurement-diversity lightbulb on the metric pages, the
sleep-source warning on the dashboard tile, the score coverage
breakdown, the target status pill, the range bar's marker, the colour
hint of the dashboard averages and the full token and user names in
the admin token list. The lightbulb showed a button that did nothing,
the warning a sign nobody could read.

They open on a tap now: InfoPopover for the two icon buttons, a
Popover on the meter, pill, marker, averages and cells. Where the
trigger sits in a link (a dashboard tile, a lab row) its tap opens the
popover instead of the page.

src/__tests__/baselines/source-function-lines.json

@@ -70,7 +70,7 @@
     "components/charts/medication-compliance-chart.tsx :: MedicationComplianceChart": 543,
     "components/charts/mood-chart.tsx :: MoodChart": 896,
     "components/charts/mood-heatmap.tsx :: MoodHeatmap": 296,
-    "components/charts/trend-card.tsx :: TrendCard": 365,
+    "components/charts/trend-card.tsx :: TrendCard": 351,
     "components/clinician/clinician-view.tsx :: ClinicianView": 223,
     "components/command-palette/command-palette.tsx :: PaletteBody": 333,
     "components/custom-metrics/custom-metric-chart.tsx :: CustomMetricChart": 231,