feat(platform): Add onRouterTransitionStart

[chargome]

Adds the future-proof way of instrumenting client-side navigations by using onRouterTransitionStart

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
develop-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 20, 2025 2:09pm
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 20, 2025 2:09pm

[codecov]

Bundle Report

Changes will increase total bundle size by 44 bytes (0.0%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	10.92MB	-9 bytes (-0.0%) ⬇️
sentry-docs-client-array-push	9.8MB	53 bytes (0.0%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: sentry-docs-client-array-push

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
static/chunks/pages/_app-*.js	-3 bytes	873.24kB	-0.0%
static/chunks/7750-*.js	40 bytes	415.85kB	0.01%
static/chunks/main-*.js	16 bytes	1.67kB	0.97%
server/middleware-*.js	5.55kB	6.55kB	555.3% ⚠️
server/middleware-*.js	-5.55kB	1.0kB	-84.74%
static/YBk-*.js (New)	684 bytes	684 bytes	100.0% 🚀
static/YBk-*.js (New)	77 bytes	77 bytes	100.0% 🚀
static/TsfbY7g1fLQr67fVMlmwk/_buildManifest.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/TsfbY7g1fLQr67fVMlmwk/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️

Files in static/chunks/main-*.js:

• ./src/instrumentation-client.ts → Total Size: 1.4kB

view changes for bundle: sentry-docs-server-cjs

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
1729.js	-3 bytes	1.64MB	-0.0%
../instrumentation.js	-3 bytes	973.36kB	-0.0%
9523.js	-3 bytes	949.31kB	-0.0%