fix: allow caret placement inside commented text on click (SD-2442)

[luccas-harbour]

Summary

• Fixes a bug where clicking on text covered by a single comment highlight would short-circuit caret placement, making it impossible to position the cursor within commented text
• Direct clicks on comment highlight spans now fall through to the generic pointer handling, allowing normal caret placement while still supporting nearby/gap clicks for comment activation
• Adds a Playwright behavior test (sd-2442-commented-text-caret.spec.ts) and updates existing unit tests to reflect the new behavior

[linear]

SD-2442 BUG: Cursor Cannot be Placed in Text Associated with a Comment

[caio-pizzol]

@luccas-harbour fix looks good, no bugs found. clicking on commented text places the caret correctly and the right comment gets selected — tested all the cases (single comment, overlapping comments, re-clicking same comment).

one side effect: clicking commented text highlights the comment bubble but doesn't open the reply thread like google docs does. filed SD-2460 for that — not a blocker here.

left one small inline comment on the test helpers.

[caio-pizzol]

this math always simplifies to coords.left + 1 — the min/max wrapping doesn't do anything. same thing in rightClickAtDocPos below. worth simplifying?

Suggested change

	return coords;
	const x = coords.left + 1;