Fitbit Air: Health Connect sync + vitals dashboard

- react-native-health-connect (config plugin, minSdk 26, 11 read perms)
- sync-on-open + manual sync: incremental via server watermark, chunked
  POST to /api/health/v1/fitbit/sync (HR, resting HR, HRV, SpO2, resp
  rate, steps/distance/kcal/floors dailies, staged sleep sessions)
- Fitbit screen: steps/RHR/HRV/SpO2 tiles + daily charts + sleep list +
  per-stream record counts (answers the which-types-does-Google-Health-
  share question empirically)
- Sleep tab now merges Fitbit Air nights (wins over older sources)
- Today screen Fitbit card

Server side (deployed separately on VPS): hc_samples/hc_daily/hc_sleep
tables + sync/latest/summary endpoints in health-api; Caddy routes POST
/api/health/v1/fitbit/* behind the same basic_auth.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

package-lock.json

@@ -27,6 +27,7 @@
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@@ -36,6 +37,7 @@
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@@ -3811,6 +3813,21 @@
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
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+        "resolve-from": "^5.0.0",
+        "semver": "^7.6.0"
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@@ -6575,6 +6592,36 @@
         "react-native": "*"
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+      "license": "MIT",
+      "workspaces": [
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+        "docs"
+      ],
+      "engines": {
+        "node": ">= 16.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/matinzd/react-native-health-connect?sponsor=1"
+      },
+      "peerDependencies": {
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+        "react": "*",
+        "react-native": "*"
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