fix: add collision padding to tooltips for safe viewport margins

[drankou]

Adds a default collisionPadding of 8px to the TooltipContent primitive so tooltips keep a safe margin from viewport edges instead of rendering flush against them. This matches the existing convention in popover.tsx and dropdown-menu.tsx, which already default collisionPadding. The value remains overridable per-usage.

Closes EN-653.

🤖 Generated with Claude Code

[linear-code]

EN-653

[vercel]

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[claude]

LGTM — small, well-contained primitive default that matches the existing convention in popover.tsx and dropdown-menu.tsx.

Extended reasoning...

Overview

This PR adds a default collisionPadding={8} to the TooltipContent primitive in src/ui/primitives/tooltip.tsx so tooltips keep an 8px margin from viewport edges. The prop remains overridable per-usage via the spread props.

Security risks

None. This is a pure visual/positioning default on a Radix UI primitive wrapper — no auth, data flow, or input handling changes.

Level of scrutiny

Very low. This is a one-line config-style default on a UI primitive, with no logic changes. I verified the stated convention: popover.tsx defaults to collisionPadding={10} and dropdown-menu.tsx defaults to collisionPadding={10}, so adding a default to tooltip aligns with the established pattern (the slightly smaller 8px value is a reasonable choice for tooltips, which are typically smaller than popovers/menus).

Other factors

The bug hunting system found no bugs. The change is overridable, so any consumer that explicitly passes collisionPadding retains its current behavior. Vercel preview deployment built successfully.