feat(telemetry): Sentry + PostHog quality pass (#546)

Comprehensive telemetry quality improvements across Sentry and PostHog, grounded in an audit of the live data plus current best-practice research.

Sentry: job_id/instance_id tags, operational fingerprinting, PII-safe settings context on bug events, web tag population + extension-noise filtering, an early-crash buffer, http status/method kept on breadcrumbs, and a gated-off-by-default performance-tracing re-enable (tracesSampler that zeroes db/redis/queue-poll root spans + drops the Redis integration) with worker job spans and canonical-host cron monitors.

PostHog: history_change SPA pageviews, instance_id super property for fleet rollups, enriched tool_used (formats, byte sizes, is_batch, execution_hint, real error_kind taxonomy), the previously-dead result_saved/batch_processed/ai_bundle_prompted events fired, search click-through, editor + Automate authoring + auth instrumentation, a before_send PII boundary, and minimal opt-in landing-site pageviews.

apps/web/src/pages/home-page.tsx

@@ -403,7 +403,22 @@ function SearchResults({
     <div className="space-y-4">
       <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-2">
         {results.map((tool) => (
-          <ToolCard key={tool.id} tool={tool} variant="descriptive" showModalityBadge showPin />
+          <ToolCard
+            key={tool.id}
+            tool={tool}
+            variant="descriptive"
+            showModalityBadge
+            showPin
+            onNavigate={() => {
+              // search -> click attribution: which result the user opened.
+              import("@/lib/analytics").then(({ track }) =>
+                track(ANALYTICS_EVENTS.SEARCH, {
+                  results_count: results.length,
+                  clicked_tool_id: tool.id,
+                }),
+              );
+            }}
+          />
         ))}
       </div>
       <div className="pt-1 text-center">