fix(observability): match minified React error format in PostHog filter (SHA-2377) (#220)

SHA-2240 (commit 25b7d89) shipped suppressHydrationWarning at the DOM
level + IGNORED_PATTERNS for unminified hydration error messages. But
production builds minify React errors as "Minified React error #N;
visit https://react.dev/errors/N..." — the form PostHog actually
captures from production users.

PostHog 14d audit (2026-05-08): docs continued to ingest ~125 React #418
hits across 84 distinct users after the SHA-2240 fix — all in the
minified format that the existing patterns don't match.

Two changes:

1. Add /Minified React error #(310|418|423|425)/ to IGNORED_PATTERNS so
   production-minified React errors are filtered alongside the
   un-minified dev-build versions.

2. Generalize the prism_bash_exports special-case to /prism_\w+_exports/
   plus /Export 'prism_/ + /local binding for export 'prism_/. Same root
   cause (PrismJS-based browser extensions injecting into the page); the
   audit showed prism_python_exports also firing alongside prism_bash.

Pure analytics-filter change; no runtime behavior modified. Underlying
hydration suppression from SHA-2240 still in place at the DOM layer.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Mlaz-code

components/PostHogProvider.tsx

@@ -12,10 +12,19 @@ const IGNORED_PATTERNS = [
   /moz-extension:\/\//,
   /ChunkLoadError/,
   /Loading chunk/,
-  /prism_bash_exports/,  // browser extension (PrismJS-based dev tools) injecting into the page
-  // React hydration errors (#418, #423, #425) — mismatches are from Nextra internals
-  // (next-themes localStorage reads, Switchers conditional rendering). Suppressed at
-  // the DOM level via suppressHydrationWarning; PostHog sees them as noise.
+  // PrismJS-based browser extensions inject a global Prism whose dynamic-import
+  // chunks fail to resolve. Generalized from the prism_bash_exports special-case
+  // shipped in SHA-2240 to also cover prism_python_exports and future variants.
+  /prism_\w+_exports/,
+  /Export 'prism_/,
+  /local binding for export 'prism_/,
+  // React hydration/render errors (#418, #423, #425) — mismatches are from Nextra
+  // internals (next-themes localStorage reads, Switchers conditional rendering).
+  // Suppressed at the DOM level via suppressHydrationWarning. The unminified-message
+  // patterns below remain for dev/local builds; production minification emits as
+  // "Minified React error #N" — that's the form PostHog actually captures, so we
+  // need to match both shapes.
+  /Minified React error #(310|418|423|425)/,
   /Hydration failed/,
   /There was an error while hydrating/,
   /Text content did not match/,