docs(js-browser): adding predefined matches for ignoring common spans

[nikolovlazar]

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Adding some predefined matches for ignoring common spans.

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PRE-MERGE CHECKLIST

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• Checked Vercel preview for correctness, including links
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Project	Deployment	Preview	Comments	Updated (UTC)
sentry-docs	Ready	Preview	Comment	Oct 2, 2025 6:53pm

1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
develop-docs	Ignored	Preview		Oct 2, 2025 6:53pm

[codecov]

Bundle Report

Changes will decrease total bundle size by 15 bytes (-0.0%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-client-array-push	10.13MB	-6 bytes (-0.0%) ⬇️
sentry-docs-server-cjs	12.93MB	-9 bytes (-0.0%) ⬇️

Affected Assets, Files, and Routes:

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

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
1729.js	-3 bytes	1.78MB	-0.0%
../instrumentation.js	-3 bytes	1.1MB	-0.0%
9523.js	-3 bytes	1.08MB	-0.0%

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	882.71kB	-0.0%
static/chunks/8321-*.js	-3 bytes	425.87kB	-0.0%
static/SqLTxrpVXjh0KZcmybNn8/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/SqLTxrpVXjh0KZcmybNn8/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/83XjsPkuypo0VSMduTpsP/_buildManifest.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/83XjsPkuypo0VSMduTpsP/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️

[cursor]

Bug: Regex Patterns Incorrectly Match File Extensions

The ignoreSpans examples for CSS, JS, and image files use regex patterns that are too broad. The .*$ at the end allows them to incorrectly match filenames containing the extension string but not ending with it (e.g., file.css.map, script.js.backup). This could lead to unintended spans being ignored.