feat(billing): unify upgrade routing with reason context + storage/tables limit emails (#5171)

* feat(billing): unify upgrade routing with reason context + storage/tables limit emails

* fix(billing): re-arm limit-notification dedup on usage drops (prior-usage + decrement)

* fix(billing): isolate per-admin email failures in org limit notifications

* fix(billing): re-arm limit dedup at zero usage and zero prior usage (full clear / wipe-rebuild)

* fix(billing): make storage-decrement notification re-arm only (never send on a shrink)

* fix(billing): resolve recipients before claiming so opt-outs don't burn the dedup threshold

* fix(billing): fire table limit emails on upsert inserts via shared notifyTableRowUsage

* chore(billing): only log a limit email as sent when a recipient actually received it

* chore(billing): match to_jsonb int cast between claim and re-arm for consistency

* fix(billing): notify table limits post-commit so a rolled-back insert never emails or burns the claim

* feat(pi): swap Pi Coding Agent icon to the pi glyph and use a black bgColor

* fix(billing): drop priorUsage re-arm to make dedup a single atomic claim (no duplicate-email race)

* docs(billing): move limit-notification rationale to TSDoc, correct tables warn-once behavior

* docs(db): note limit_notifications dedup is per-account, not per-table

* perf(billing): cut redundant subscription fetches and edge-gate notify to slash DB load

* docs(billing): drop self-explanatory inline comments from the notification path

apps/docs/components/icons.tsx

@@ -5318,6 +5318,18 @@ export function SmtpIcon(props: SVGProps<SVGSVGElement>) {
   )
 }
 
+export function PiIcon(props: SVGProps<SVGSVGElement>) {
+  return (
+    <svg {...props} xmlns='http://www.w3.org/2000/svg' viewBox='0 0 800 800' fill='currentColor'>
+      <path
+        fillRule='evenodd'
+        d='M165.29 165.29 H517.36 V400 H400 V517.36 H282.65 V634.72 H165.29 Z M282.65 282.65 V400 H400 V282.65 Z'
+      />
+      <path d='M517.36 400 H634.72 V634.72 H517.36 Z' />
+    </svg>
+  )
+}
+
 export function SshIcon(props: SVGProps<SVGSVGElement>) {
   return (
     <svg