Summary

• Adds context-aware SQL autocomplete that suggests table names, SQL keywords, types, and 53+ PostgreSQL built-in functions as you type
• Popup appears automatically while typing or via Ctrl+Space, positioned relative to cursor with overflow handling
• Navigate suggestions with Up/Down, accept with Tab/Enter, dismiss with Esc; each suggestion shows its kind label (KW/TY/TBL/COL/FN)

Changes

• src/ui/app.rs: Added AutocompleteSuggestion, SuggestionKind, and AutocompleteState types; added SQL_FUNCTIONS constant with 53 PostgreSQL functions; modified editor input handling to trigger/navigate autocomplete; added update_autocomplete() and accept_autocomplete() methods
• src/ui/components.rs: Added draw_autocomplete() popup renderer with kind labels and selection highlighting; updated help overlay with Ctrl+Space shortcut

How It Works

1. As the user types in the SQL editor, update_autocomplete() extracts the current word prefix
2. Suggestions are built from: connected database table names, SQL keywords, SQL types, and built-in functions
3. Results are filtered by prefix match, limited to 10 suggestions
4. The popup renders below the cursor, shifting position if it would overflow the screen

Test plan

• cargo check passes
• cargo clippy passes with no warnings
• cargo fmt produces no changes
• All 124 tests pass
• Manual testing: type SQL keywords and verify suggestions appear
• Manual testing: connect to a database and verify table names appear in suggestions
• Manual testing: verify Ctrl+Space triggers autocomplete
• Manual testing: verify Tab/Enter accepts, Esc dismisses, Up/Down navigates

Closes #11

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