homeassistant: render byte counts as plain decimals

Part of #157. The null-safe fallback helpers from #99 pass values through fromYaml, which parses every number as float64; Go's "%v" switches float64 to exponential notation from about 1e6 upwards. A bare byte count like 1048576 therefore reached multiplyQuantity as "1.048576e+06" and the render aborted on the suffix check.

This is the canonical correction already merged into the other charts, adopted verbatim with this chart's define prefix: multiplyQuantity formats its input and its non-integer product through a new formatNumber helper. The fromYaml round-trip itself is not touched - it is not the cause, and it has just been unified across all charts.

Measured against ci/homeassistant/test-values.yaml: resources.requests.memory=1048576 aborted before and now yields request 1048576 / limit "3145728"; 65536 still yields 196608. The silent variant matters here too - values.schema.json types resources.limitFactor as "number" with exclusiveMinimum 0, so a fractional factor is allowed and rendered an invalid quantity without any error (limitFactor 1.5 with memory 999999 produced memory: "1.4999985e+06"); it now produces 1499998.5.

homeassistant/templates/_helpers.tpl

@@ -67,7 +67,7 @@ Handles plain numbers ("2", "0.5", 1073741824), decimal ("1.5Gi"), binary
 results are printed without a decimal point.
 */}}
 {{- define "homeassistant.multiplyQuantity" -}}
-{{- $quantity := printf "%v" .quantity -}}
+{{- $quantity := include "homeassistant.formatNumber" .quantity -}}
 {{- $number := regexFind "^[0-9]+(\\.[0-9]+)?" $quantity -}}
 {{- if not $number -}}
 {{- fail (printf "cannot parse resource quantity %q" $quantity) -}}
@@ -80,7 +80,24 @@ results are printed without a decimal point.
 {{- if eq $product (floor $product) -}}
 {{- printf "%d%s" (int64 $product) $suffix -}}
 {{- else -}}
-{{- printf "%v%s" $product $suffix -}}
+{{- printf "%s%s" (include "homeassistant.formatNumber" $product) $suffix -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Render a number as a plain decimal string, never in exponential notation.
+
+Why this exists (issue #157): the null-safe fallback helpers pass values
+through fromYaml, which parses every number as float64. Go's "%v" switches
+float64 to exponential notation from about 1e6 upwards, so a bare byte count
+like 1048576 became "1.048576e+06" - not a valid Kubernetes quantity, and the
+render aborted. Strings ("512Mi") are passed through untouched.
+*/}}
+{{- define "homeassistant.formatNumber" -}}
+{{- if kindIs "float64" . -}}
+{{- regexReplaceAll "\\.?0+$" (printf "%.10f" .) "" -}}
+{{- else -}}
+{{- printf "%v" . -}}
 {{- end -}}
 {{- end -}}