Update extension store listing for History

[spencerc99]

Summary

• lead the extension listing with the browsing History experience
• describe per-site time, explorations, daily portraits, and the walking record
• refresh Safari App Store promotional text, keywords, URLs, and Firefox copy

Validation

• git diff --check origin/main...HEAD
• copied the listing into the App Store Connect draft and uploaded all eight numbered screenshots

Screenshots

The App Store Connect draft contains all numbered images from extension-screenshots/.

[pkg-pr-new]

Open in StackBlitz

bun add https://pkg.pr.new/@playhtml/common@359

bun add https://pkg.pr.new/playhtml@359

bun add https://pkg.pr.new/@playhtml/react@359

commit: 89c0971

[spencerc99]

Code review

• P2 extension/STORE_LISTING.md:14 updates the public extension-store copy without the required screenshots of the finished surface. The repository instructions require every user-facing change to be verified on the real affected surface and to include screenshots in the PR. The PR body says the App Store Connect draft was populated, but neither the body nor comments contains a screenshot or evidence link. Attach screenshots of the populated App Store Connect listing (and any other store previews already updated) before merge.