Feature: expand tooltips to cluster, database, and collection levels

[tnaum-ms]

Goal

Expanding on the initial tooltip work from #579 (cluster-level tooltips), this PR adds rich markdown tooltips to database and collection tree items in the Connections view.

All data shown is "cheap" — it comes from data already fetched during tree expansion (listDatabases, listCollections, estimateDocumentCount), so no additional API calls are needed.

Changes

Cluster tooltip (cherry-picked from rel/release_0.8.0)

• Name — cluster display name (heading)
• Host — server hostname(s) parsed from the connection string
• Auth — authentication method (e.g. Username and Password, Entra ID)
• User — connection username, shown only for SCRAM / native auth
• Security — TLS/SSL status, shown only for local emulator connections

Database tooltip (new)

• Name — database name (heading)
• Database badge for type identification

Collection tooltip (new)

• Name — collection name (heading)
• Type badge — Collection, View, or Timeseries
• Database — parent database name for context
• Documents — formatted document count (loaded asynchronously, updates on refresh)

Design decisions

• Uses isTrusted = false on all tooltips to prevent arbitrary markdown execution
• User-provided text (names) is escaped via escapeMarkdown() to prevent markdown injection
• Follows the same formatting pattern as the existing index tooltips (badges + properties)
• No new API calls: type comes from listCollections(), documentCount is already loaded async for the tree item description

Closes #579

[Copilot]

Pull request overview

Improves Connections View tooltips by enriching DocumentDBClusterItem with additional connection metadata (host/auth/user/emulator security) sourced from storage-backed connection models.

Changes:

• Extend ConnectionClusterModel with selectedAuthMethod and connectionUser for tooltip display.
• Populate those fields when building connection tree models (root, folders, local emulators).
• Replace the previous tooltip logic with a dedicated markdown tooltip builder (host/auth/user/security).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/tree/connections-view/models/ConnectionClusterModel.ts	Adds optional auth/username fields to the connections-view cluster model for tooltip display.
src/tree/connections-view/LocalEmulators/LocalEmulatorsItem.ts	Passes stored selectedAuthMethod and nativeAuthConfig.connectionUser into the emulator connection cluster model.
src/tree/connections-view/FolderItem.ts	Passes stored selectedAuthMethod and nativeAuthConfig.connectionUser into folder child connection cluster models.
src/tree/connections-view/DocumentDBClusterItem.ts	Implements a new markdown tooltip builder (host/auth/user/security) and introduces markdown escaping helper.
src/tree/connections-view/ConnectionsBranchDataProvider.ts	Passes stored selectedAuthMethod and nativeAuthConfig.connectionUser into root connection cluster models.