fitness: use time-scale x-axis for weight chart to handle date gaps

Weight chart now spaces data points proportionally to actual dates
instead of evenly. Days without a weight log no longer compress adjacent
points together. Uses Chart.js time scale with chartjs-adapter-date-fns.

pnpm-lock.yaml

@@ -20,6 +20,12 @@ importers:
       chart.js:
         specifier: ^4.5.0
         version: 4.5.0
+      chartjs-adapter-date-fns:
+        specifier: ^3.0.0
+        version: 3.0.0(chart.js@4.5.0)(date-fns@4.1.0)
+      date-fns:
+        specifier: ^4.1.0
+        version: 4.1.0
       file-type:
         specifier: ^19.0.0
         version: 19.6.0
@@ -1086,6 +1092,12 @@ packages:
     resolution: {integrity: sha512-aYeC/jDgSEx8SHWZvANYMioYMZ2KX02W6f6uVfyteuCGcadDLcYVHdfdygsTQkQ4TKn5lghoojAsPj5pu0SnvQ==}
     engines: {pnpm: '>=8'}
 
+  chartjs-adapter-date-fns@3.0.0:
+    resolution: {integrity: sha512-Rs3iEB3Q5pJ973J93OBTpnP7qoGwvq3nUnoMdtxO+9aoJof7UFcRbWcIDteXuYd1fgAvct/32T9qaLyLuZVwCg==}
+    peerDependencies:
+      chart.js: '>=2.8.0'
+      date-fns: '>=2.0.0'
+
   chokidar@4.0.3:
     resolution: {integrity: sha512-Qgzu8kfBvo+cA4962jnP1KkS6Dop5NS6g7R5LFYJr4b8Ub94PPQXUksCw9PvXoeXPRRddRNC5C1JQUR2SMGtnA==}
     engines: {node: '>= 14.16.0'}
@@ -1137,6 +1149,9 @@ packages:
     resolution: {integrity: sha512-BnBS08aLUM+DKamupXs3w2tJJoqU+AkaE/+6vQxi/G/DPmIZFJJp9Dkb1kM03AZx8ADehDUZgsNxju3mPXZYIA==}
     engines: {node: '>=20'}
 
+  date-fns@4.1.0:
+    resolution: {integrity: sha512-Ukq0owbQXxa/U3EGtsdVBkR1w7KOQ5gIBqdH2hkvknzZPYvBxb/aa6E8L7tmjFtkwZBu3UXBbjIgPo/Ez4xaNg==}
+
   debug@4.3.4:
     resolution: {integrity: sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==}
     engines: {node: '>=6.0'}
@@ -2613,6 +2628,11 @@ snapshots:
     dependencies:
       '@kurkle/color': 0.3.4
 
+  chartjs-adapter-date-fns@3.0.0(chart.js@4.5.0)(date-fns@4.1.0):
+    dependencies:
+      chart.js: 4.5.0
+      date-fns: 4.1.0
+
   chokidar@4.0.3:
     dependencies:
       readdirp: 4.1.2
@@ -2661,6 +2681,8 @@ snapshots:
       whatwg-mimetype: 4.0.0
       whatwg-url: 15.1.0
 
+  date-fns@4.1.0: {}
+
   debug@4.3.4:
     dependencies:
       ms: 2.1.2