fix(ew): add Block Library to the tool panel dropdown

[amol-anand]

Adds Block Library to the ew canvas tool panel dropdown

Description

Adds Block Library to the right tool panel dropdown, alongside the other tools (Outline, Files, Versions, Templates, Icons, Placeholders, AEM Assets).

Selecting it opens the same block library dialog that the slash menu and outline "+" button already open — inserting a variant drops it at the current cursor position in the editor.

Motivation and Context

Block Library is the odd one out: every other tool is reachable from the tool panel dropdown, but the block library was only accessible via the slash menu and a small, easy-to-miss + button on the outline section header rows. This puts it where users already look for tools, so it's discoverable in the same place as everything else — without removing the existing entry points.

Rather than rendering it inline like the other library tools (its tree + preview layout needs far more room than the side panel offers), the dropdown entry reuses the existing openBlockLibraryModal() flow. This keeps a single block-library UI and avoids offering two different experiences for the same feature.

Implementation
extensionToPanelView special-cases the blocks extension to produce a view with a new experience: 'modal' and an openModal() that calls the existing openBlockLibraryModal(), wiring insertion into the active editor view.
ew-tool-panel handles the new modal experience in showPanel — mirroring the existing window case: it fires the action and returns without mounting anything inline or changing the active tab. The dropdown item shows the "opens externally" affordance.

No changes to the block library modal component or its styles — it's the exact same dialog, now reachable from a third entry point.

How Has This Been Tested?

https://shwblock--da-live--adobe.aem.live/canvas#/aem-sandbox/block-collection/drafts/amol/shwblock

Verified Block Library appears in the tool panel dropdown for a site with a configured blocks library, grouped under Library.
Selecting it opens the block library dialog; searching, expanding blocks, and previewing variants all work as before.
Inserting a variant places the block at the current cursor position in the editor.
Confirmed the existing entry points (slash menu, outline section "+" button) still work unchanged.
Confirmed the dropdown entry does not appear for sites with no blocks library configured.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

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Commits

• 833bf46 ✅ (latest)
• de44688 ✅
• 7bbe83b ✅

[mhaack]

@amol-anand can you have a look at the link issues and we should add some tests as well