Show a Send to my computer button instead of the Mac download on phones

[brsbl]

Human comments

What was wrong

On phones and tablets, every getbb.app page's main install button said "Download for macOS". A phone visitor can't use that, so the hero had no useful action for them. Paid search clicks from phones land on these pages too.

What changed

• On touch-only devices, the shared install buttons read "Send to my computer" on the homepage and comparison pages, and on any page that adds them later.
• Tapping it opens the phone's share sheet with the current page's link, so ad tracking parameters carry to the computer.
• Where sharing isn't available, it copies the link and shows "Link copied".
• The note under it reads "bb runs on macOS, Windows, and Linux".
• Taps are tracked as landing_send_to_computer_clicked with the button's placement.
• Desktop is unchanged: both buttons are in the markup and CSS picks one, so phones see no flash after load.

How you verified

• Chrome for Testing, headless, 390×844 with touch, on 98e6a84ad5: the homepage and the Cursor comparison page show "Send to my computer", with no console errors.
• Without navigator.share, a tap copies the link and shows "Link copied".
• At 1440×900 without touch, the Cursor comparison page shows "Download for macOS" and hides the new button.
• iPhone 16 simulator, iOS Safari 18.5, production build of 98e6a84ad5: the button replaces the Mac download. A tap passes the page URL, ad parameters included, to the share sheet, and falls back to copying it.
• Slop Cop review (security, architecture, code quality, performance, end to end): no P0 or P1 findings.
• Remote CI: passed on 98e6a84ad5.

Screenshots

Before: 0146d8122e (main) · After: 98e6a84ad5 · Captured at 2×

Screen / state	Viewport	Before	After
Homepage hero	Mobile · 390×844
Comparison page hero	Mobile · 390×844
Install button tapped, no share sheet	Mobile · 390×844	Not on main

BB-Thread: 🔥🔥 𝒃𝒃 comparison and guide pages

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