SD-2664 - feature support word style update field interactions for TOC

[chittolinag]

Issue

Word-style "Update Field" interactions (context menu + F9) aren't wired up in SuperDoc. The document API already exposes editor.doc.toc.update(), but no user-facing action calls it. Scope of this PR is Table of Contents only — other field types are deferred.

Proposed solution

• Right-click → "Update table of contents" when the cursor is inside a TOC.
• F9 rebuilds every TOC in the document.
• Fixed a handful of issues in the rebuild path that surfaced once the action was actually exercised end-to-end (font/style preservation, dot leader, spacing, pasted-heading detection).
• Added unit tests for the context-menu item, the F9 command, and the rebuild helpers, plus a behavior test that loads a TOC docx, presses F9, and verifies the rebuilt entries match the document's headings.

[linear]

SD-2664 Feature: Support Word-style Update Field interactions for document fields

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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