Optimize scroll performance, security headers, rate limiting, and accessibility - #125
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…to firebase.json This change enhances the defense-in-depth posture of the application by: 1. Setting X-XSS-Protection to '1; mode=block' to prevent reflected cross-site scripting in legacy browsers. 2. Setting Cross-Origin-Opener-Policy to 'same-origin' to isolate the browsing context from potential cross-origin document-referencing leaks and attacks (e.g., Spectre, XS-Leaks). Also documents this enhancement in .jules/sentinel.md journal.
Adds a visually hidden screen reader text `(opens in a new tab)` to the target="_blank" anchor link in the header Banner component. This ensures compliance with WCAG accessibility standards for screen-reader users without affecting the visual layout. Also includes unit tests verifying the presence of this visually hidden instruction.
Optimize high-frequency scroll listeners in the codebase to prevent redundant React state updates on every scroll frame. By introducing closure-scoped tracker variables within the respective `useEffect` bounds, we only invoke state setters when crossing visibility/position thresholds, transforming render dispatch from O(N) to O(1). Additionally, the header scroll listener is configured with passive: true to avoid blocking main thread scrolling.
Bumps the npm_and_yarn group with 1 update in the / directory: [postcss](https://github.com/postcss/postcss). Updates `postcss` from 8.5.15 to 8.5.23 - [Release notes](https://github.com/postcss/postcss/releases) - [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md) - [Commits](postcss/postcss@8.5.15...8.5.23) Updates `nanoid` from 3.3.14 to 3.3.18 - [Release notes](https://github.com/ai/nanoid/releases) - [Changelog](https://github.com/ai/nanoid/blob/3.3.18/CHANGELOG.md) - [Commits](ai/nanoid@3.3.14...3.3.18) --- updated-dependencies: - dependency-name: postcss dependency-version: 8.5.23 dependency-type: direct:development dependency-group: npm_and_yarn - dependency-name: nanoid dependency-version: 3.3.18 dependency-type: indirect dependency-group: npm_and_yarn ... Signed-off-by: dependabot[bot] <support@github.com>
Added visually hidden screen reader text to external markdown links in chat message bubbles so screen reader users are notified when a link opens in a new tab.
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Summary
Consolidates the following open pull requests into a single unified PR:
Verification
pnpm test.