fix(web): setLink consistency

[hejsztynx]

Summary

Closes #757

There were two issues with setLink on web:

• the text serialization was inconsistent with what onChangeSelection returned
• when text="", the method was no-op, whereas on mobile it removes the text (what we want)

Fix addresses both issues.

Added e2e tests for the first serialization related issue.

Added a temporary button in example-web app, so you can see what happens when you call setLink with text="". This will be reverted before the PR's merge.

Test Plan

Experiment with setLink across paragraph bounds and the setLink(text="") button.

Screenshots / Videos

Before:

The serialization differed, so setLink falsely assumed that text it got as an argument, differs from the actual text in the editor. This caused a path, where the content would get forcifully replaced with that "falsely new" text, which caused paragraphs to drop, and a literal \n to get inserted. It visually looks fine, but HTML proves the incorrectness.

Screen.Recording.2026-08-14.at.12.18.10.mov

After:

Screen.Recording.2026-08-14.at.12.19.42.mov

Compatibility

OS	Implemented
iOS	❌
Android	❌
Web	✅

Checklist

• E2E tests are passing
• Required E2E tests have been added (if applicable)

[hejsztynx]

This is for manual test purposes only. Will be removed on merge

[Copilot]

Pull request overview

This PR fixes setLink behavior on web to match the native text-coordinate model and mobile semantics, ensuring link text serialization is consistent with onChangeSelection and allowing setLink(text="") to remove the selected range.

Changes:

• Use nativeLeafText(...) for link text serialization in onLinkDetected and setLink comparisons to ensure consistent newline/leaf handling.
• Update setLink on web to delete the selected range when text === "" (instead of being a no-op).
• Add Playwright e2e coverage for cross-paragraph selection round-tripping and add example-web UI hooks to exercise the behavior.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/web/useOnLinkDetected.ts	Aligns emitted link text with native leaf-text serialization.
src/web/formats/EnrichedLink.ts	Fixes setLink semantics (delete on empty text) and uses native leaf-text for equality checks.
apps/example-web/src/testScreens/TestLinks.tsx	Captures and exposes onChangeSelection payload; adds a button to apply setLink from the captured selection.
apps/example-web/src/App.tsx	Adds a temporary manual-test button to call setLink with text="".
.playwright/tests/links.spec.ts	Adds e2e tests validating selection text round-trips through setLink across block boundaries (including inline marks).

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