feat(import): dedup dialog when importing duplicate connections

[J2TeamNNL]

Summary

• When importing connections and a duplicate is detected (same host, port, database, username), a dialog offers: Replace, As Copy, or Skip
• Dedup key is (host, port, database, username), case-insensitive
• "As Copy" appends " (Imported)" with collision handling: " (Imported 2)", " (Imported 3)", etc.
• "Replace" updates connection metadata only; existing Keychain entries are not overwritten for foreign-app imports
• Warning strings for missing SSH keys, SSL certs, and unknown database types are now localized

Test plan

• Import a file containing a connection already in TablePro → dialog appears with 3 options
• Replace → existing connection updated, same ID
• As Copy → new connection created with " (Imported)" suffix; importing twice produces " (Imported 2)"
• Skip → connection not imported, no duplicate created
• Import from DBeaver with duplicate → Replace does not overwrite existing password in Keychain
• ConnectionImportServiceTests all pass

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Include Redis DB in duplicate keys

For Redis connections the selected database is stored in redisDatabase (and connection setup falls back to it when database is empty), but this new duplicate key only compares database. Importing a Redis connection for DB 1 when an otherwise identical DB 0 connection already exists will be marked as a duplicate, so choosing Replace can overwrite the wrong saved connection or the distinct DB is skipped by default.

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[chatgpt-codex-connector]

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Reviewed commit: dbdb7962a0

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[chatgpt-codex-connector]

Restore credentials for replaced imports

When importing from another app with credentials and the user selects Replace for a duplicate, prepareImport only records added rows in newConnectionIdMap, so passing this map makes restoreCredentials skip the replaced connection entirely. The connection settings are overwritten, but the saved password/SSH/plugin secrets remain stale or missing for the existing UUID; use the full connectionIdMap for replacements that should receive the imported credentials.

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