feat(connections): show database name in the connection list

[datlechin]

Closes #1535.

Problem

Connections that share a name and host but target different databases render identically in the connection list, because the row subtitle only shows host/host:port. The database is never displayed (though search already filters on it).

Change

The row subtitle now reads endpoint · database · via ssh. The connection name stays the primary label; the database is added as a secondary descriptor so same-name/same-host rows are distinguishable.

The subtitle logic moved out of the SwiftUI view into pure computed properties on DatabaseConnection, which made it unit-testable (it had zero tests before). The database segment is driver-aware via PathFieldRole:

• Relational and unknown future types: database name after the host
• Redis: db {index} when an index is set
• SQLite/DuckDB: file path only (host is empty, so no duplication)
• Oracle: service name
• MongoDB replica sets: host count (+N more)
• SSH via stays last

Row styling is unchanged: it already used the macOS two-line pattern (.subheadline + .secondary, single line, middle truncation), which matches the HIG guidance for distinguishing similar rows.

Tests

Added DatabaseConnectionDisplayTests (13 cases) covering each branch: default/non-default port, empty database, file-based paths, Redis index present/absent, Oracle service name, MongoDB multi-host, SSH via ordering, and unknown type fallback.

Notes

ExportableConnection.displaySubtitle (import-preview DTO) is left unchanged: it has no access to PathFieldRole, so a driver-unaware change there would be worse. Can follow up if that surface should show the database too.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Use the Oracle service field in subtitles

For Oracle connections created through the form or URL import, the service name is stored in connection.oracleServiceName / additionalFields["oracleServiceName"] and database can remain empty; the Oracle driver also connects using that additional field. Treating .serviceName the same as .database here means those rows still render only the host, so two Oracle connections to different services on the same host remain indistinguishable despite the new feature.

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