Updated Playwright tests, modify edit mode popover flipping

[mdo]

Follow up to #927.

• Refines selection action test
• Adds another selection action test to confirm flipping behaviors
• Modifies popover flipping detection for instances where short files cause placement issues

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Invalidate cached code rect when code height changes

Because getPlacementBounds() now clamps to codeRect.bottom, the cached [data-code] rect's height directly controls placement. That rect is only dirtied when setViewportElements() sees a different code element and on scroll/resize; normal edits can append/remove rows in the existing code element, so after inserting or deleting lines the manager can keep the old bottom until the user scrolls or resizes. In that state first/last-line selection-action or marker popovers can flip against a stale clip edge and still be clipped, or flip unnecessarily.

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[mdo]

@ije Could use your eyes on the source changes here, please.

[ije]

Lgtm