fix(text-editor): prevent content loss when pasting tables into cells

[john-traas]

Summary

• Adds a new table-paste-plugin registered before prosemirror-tables' tableEditing() so its destructive cell-grid paste cannot run when the caret is a plain TextSelection inside an existing cell
• When the user pastes a table while the caret is inside a cell, the new plugin inserts the pasted table as a fresh sibling immediately after the enclosing table, leaving every existing cell, paragraph, and trailing row intact
• All other paste paths (CellSelection, outside-table, non-table slice) fall through to the existing default behavior

Closes part of lime-19624 / Lundalogik/crm-client#1050. The reported bug is "pasting table rows in the Conversations composer deletes other rows" — confirmed in 4 environments. The composer opts into contentType='html' legitimately, so the fix lives here, not in limepkg-email.

Out of scope (follow-ups)

• Visible table borders (the _tables.scss selector is gated on :host(limel-markdown:not(.no-table-styles)) and does not match limel-prosemirror-adapter)
• Table-management menu commands (delete table, exit to next block)

Test plan

• Unit suite passes: npx vitest run src/components/text-editor/prosemirror-adapter/plugins/table-paste-plugin.spec.ts --project spec
• Full text-editor specs pass: npx vitest run src/components/text-editor --project spec
• In npm start, open text-editor-with-tables example, copy 2-3 rows from Excel, paste, then place caret inside a cell and paste again — no rows are deleted
• Reproduce reporter sequence (paste → Enter → type → paste again) and verify all intermediate paragraphs survive
• Confirm existing CellSelection cell-grid replace still works (select multiple cells, paste a table — selected cells replaced as before)

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[Copilot]

Pull request overview

Fixes a content-loss bug in the text editor where pasting a table while the caret is inside an existing cell would destructively replace surrounding rows/paragraphs. A new table-paste-plugin registered before prosemirror-tables' tableEditing() intercepts that specific case and inserts the pasted table as a fresh sibling after the enclosing table.

Changes:

• Adds table-paste-plugin.ts that intercepts paste only when selection is a TextSelection inside a table and the pasted slice starts with a <table>, inserting the pasted table as a new sibling block after the enclosing table.
• Registers the new plugin before tableEditing() in getTableEditingPlugins.
• Adds spec coverage for the in-cell paste, preservation of surrounding content, non-table slice fallthrough, CellSelection fallthrough, and outside-table fallthrough.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/components/text-editor/prosemirror-adapter/plugins/table-paste-plugin.ts	New plugin that intercepts in-cell table pastes and inserts them as siblings after the enclosing table.
src/components/text-editor/prosemirror-adapter/plugins/table-plugin.ts	Registers the new paste plugin ahead of tableEditing().
src/components/text-editor/prosemirror-adapter/plugins/table-paste-plugin.spec.ts	Unit tests covering the new plugin's gate conditions and insertion behavior.

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[github-actions]

Documentation has been published to https://lundalogik.github.io/lime-elements/versions/PR-4084/