[oleg68]

Summary

• Added Add button — opens an input dialog to append a new model row (validates non-empty and uniqueness)
• Added Rename button — opens an input dialog pre-filled with the selected model ID; resets availability on rename (validates non-empty and uniqueness, ignores self)
• Added Sort button — sorts all rows alphabetically by model ID (case-insensitive)
• Extracted shared validateModelId(String, List, int) static helper for both Add and Rename
• Updated docs/user-manual.md with new button descriptions and dialog screenshot
• Added unit tests for validateModelId and parseModelIds in ModelAliasesDialogTest

Test plan

• Open Tools → Options → Claude Code → Profiles → Other API profile → Model Aliases…
• Verify button order: Fetch → Add → Rename → ↑ → ↓ → Sort → Delete → Prune
• Add: enter new ID → row appears at bottom, selected; blank/duplicate → error in status bar
• Rename: select row, click Rename → dialog pre-filled; change to new unique name → ID updated, availability cleared; same name → no change; duplicate → error
• Sort: click Sort with multiple rows → rows sorted alphabetically

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