fix: open effort menu with pointerdown

[ventianima-lab]

Summary

• dispatch the current ChatGPT Radix effort trigger's authoritative pointerdown event inside the document
• preserve the exact-one-visible-control and opened-menu/slider postconditions
• bump the patch release to 3.0.7

Evidence

• live launcher WebContents viewport is 1x1
• HTMLElement.click() left aria-expanded=false and rendered no menu
• in-document primary mouse pointerdown changed aria-expanded=true and exposed the Pro 5/5 slider
• no prompt was submitted during verification

Tests

• 92 provider/session tests passed; one tokenizer test timed out at its default 5s and passed alone with a 30s timeout
• 51 launcher browser tests passed
• TypeScript tsc --noEmit passed

[ventianima-lab]

Exact-head review: 19bfd70. Verified the live 1x1 launcher WebContents against current ChatGPT: synthetic click does not open the Radix effort menu; primary mouse pointerdown opens the Pro 5/5 slider. The patch retains exact-one-control selection and authoritative menu/slider postconditions, and does not submit a prompt.