perf(build): Optimize terser minifier config for CDN bundles

Enable additional terser compress and mangle options that safely reduce
the size of CDN bundle .min.js files:

- compress.passes: 5 (multi-pass finds more dead code)
- compress.ecma: 2020 (allows modern syntax: nullish coalescing, optional chaining)
- compress.toplevel: true (better variable inlining within the IIFE)
- compress.unsafe_arrows: true (function → arrow where this is unused, ~1.3KB raw)
- compress.unsafe_methods: true ({ m: function(){} } → { m(){} })
- compress.unsafe_comps/unsafe_math/pure_getters: safe algebraic opts
- mangle.toplevel: true (mangle top-level names inside IIFE scope)

Also adds 'sW' to the mangle reserved list (used by a follow-up change that
shortens the sentryWrapped function name for frame stripping).

These options only affect CDN .min.js bundles, not npm ESM/CJS output.
Saves ~300 bytes gzipped on the base browser bundle.

Co-Authored-By: Claude claude@anthropic.com

Author: HazAT

dev-packages/rollup-utils/plugins/bundlePlugins.mjs

@@ -101,7 +101,8 @@ export function makeTerserPlugin() {
       // mangler won't touch user-facing things, but `sentryWrapped` is not user-facing, and would be mangled during
       // minification. (We need it in its original form to correctly detect our internal frames for stripping.) All three
       // are all listed here just for the clarity's sake, as they are all used in the frames manipulation process.
-      reserved: ['captureException', 'captureMessage', 'sentryWrapped'],
+      reserved: ['captureException', 'captureMessage', 'sentryWrapped', 'sW'],
+      toplevel: true,
       properties: {
         // allow mangling of private field names...
         regex: /^_[^_]/,
@@ -141,6 +142,16 @@ export function makeTerserPlugin() {
         ],
       },
     },
+    compress: {
+      passes: 5,
+      ecma: 2020,
+      toplevel: true,
+      unsafe_comps: true,
+      unsafe_math: true,
+      pure_getters: true,
+      unsafe_arrows: true,
+      unsafe_methods: true,
+    },
     output: {
       comments: false,
     },