UI: Add tool list & description for extensions/MCPs

[KiKaraage]

Please explain the motivation behind the feature request.

I would like to know the tools an extension have without having to browse Goose docs/source code or ask the model themselves. Currently for each extensions only name and descriptions (and commands for custom ones) were shown.

An example I have, is, I didn't know Read and List tools were part of Developer extension. I expect those two would be a basic agentic capabilities without having to add extensions, so I was kinda surprised when disabling all extensions basically put it on chat-only mode. (Will make a separate issue related to this)

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Related scripts/components

• Card for each extensions: ui/desktop/src/components/settings/extensions/subcomponents/ExtensionItem.tsx
• Extension modal: ui/desktop/src/components/settings/extensions/modal/ExtensionModal
• Extension page: ui/desktop/src/components/extensions/ExtensionsView

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Describe the solution you'd like

1. Show number of tools in ExtensionItem cards (format: 5 tools or 🔨 5)
   a. Position suggestion 1: Beside extension toggle or config button, top part on the card - 🔨 5 fits better
   b. Position suggestion 2: Alongside the description - 5 tools fits better
2. Divide ExtensionModal into two tabs: Info tab and Configuration tab
   a. Info tab will list extension description and tool list (tool name + tool description)
   b. Configuration tab will list existing options, like STDIO/Streamable HTTP; MCP url or commands, names, env vars etc

• I have verified this does not duplicate an existing feature request

[KiKaraage]

Example of how Info section could look like on extension modal - for Computer Controller extension:

Tool Name	Description
docx_tool	Process DOCX files to extract text and create/update documents. Supports operations: extract_text: Extract all text content and structure (headings, TOC) update_doc: Create or update a document. Modes: append, replace, structured, add_image
pdf_tool	Process PDF files to extract text and images. Supports operations: extract_text: Extract all text content extract_images: Save embedded images to PNG files
web_scrape	Fetch and save content from a web page. Content can be saved as: text (HTML pages) json (API responses) binary (images/files) Returns 'Content saved to: <path>'. Use cache to read the content.
automation_script	Create and run small scripts for automation tasks (PowerShell/Batch on Windows; Shell/Ruby on macOS/Linux). Examples: Sort unique lines: sort file.txt | uniq Extract CSV column: awk -F ',' '{ print $2}' Find text: grep pattern file.txt
computer_control	Control the computer using system automation. Capabilities vary by OS: Windows: PowerShell/UI automation, system management. macOS: AppleScript for app control, UI automation, and system settings. Linux: Shell scripting, X11/Wayland, D-Bus, and process management. Can be combined with screenshot tool for visual assistance.
xlsx_tool	Process Excel (XLSX) files to read and manipulate spreadsheet data. Supports operations: list_worksheets: List names, column/row counts get_columns: Get first-row column names get_range: Get values/formulas from range (e.g., 'A1:C10') find_text: Search for text coordinates update_cell / get_cell: Modify or read specific cells save: Commit changes back to file
cache	Manage cached files and data: list: List all cached files view: View content of a cached file delete: Delete a specific cached file clear: Clear all cached files