[omartelo]

Summary

• Tour, seventh tab "Point at the page" for the 0.81.0 crosshair. Picking turns the toolbar crosshair on with its hint, a dashed outline marches over the element under the pointer with the dark tag naming it (label, component, size), a click opens the 280px note, Add note pins the element and leaves its outline in place, the tray floats over the page with Clear and Send (with its icon), and Send hands both notes to Claude Code, which edits SignupForm.tsx and reloads the page. Ring gap 5, radius 8, 5px dashes over a white halo, pin on the ring's top edge past the corner, all from browser_notes*.go. Caption in the 7 languages.
• Theme menu in the header of every landing and changelog page: System, Light and Dark, in the same dropdown as the language menu, showing the current choice's icon. docs/theme.js loads in <head> so a saved choice applies before the first paint; System leaves the page to prefers-color-scheme. On a phone the header's Download button gives way to it (the hero keeps its own).
• Catch up with 0.80/0.81: a compare table row for the session browser, and the footer feature card names the prompt cache share of the last turn.

Test plan

• go test ./internal/site/ (header parity between each landing and its changelog)
• Every tour tab in the 7 landings, the theme menu and the 7 changelogs in headless Chromium, no page errors
• Tab 7 and the theme menu checked in lich's own session browser