[datlechin]

Summary

• The Return key in the Open Quickly and Jump to Column footers is the SF Symbol return. The system font has no U+21A9, so its first draw in a process loaded Lucida Grande as a fallback: 9 to 11 ms measured in a fresh process, inside the first Cmd-Shift-O. QuickSwitcherKeyHint takes a list of glyphs instead of one string.
• The sidebar search groups the all-schema listing by schema once per listing. SchemaListingMatchesMemo reused the scan only for the same search, so every keystroke grouped all 50,000 rows again and copied each one.
• DatabaseTreeFilter.filteredTables deduplicates by the fields TableInfo.id is built from, without escaping and joining a string for each matched row. On the Oracle fixture that string was 10 of 116 samples in a filter turn.

Test plan

• New: DatabaseTreeFilterMemoTests.listingGroupingOutlivesTheSearch checks that a new search over the same listing keeps its rows grouped once and a new listing groups again. It fails on main, where each search builds new rows.
• New: DatabaseTreeFilterTests.filteredTablesKeepsKindsApart checks that a table, a view and a temporary table of one name stay apart and a repeat is dropped.
• Local: the DatabaseTreeFilter, DatabaseTreeFilterMemo, HierarchicalSchemaSearch, SidebarSchemaFilter, SidebarViewModel and Quick Switcher suites (162 tests) pass; lint clean.
• Measured with a probe linked against AppKit in a fresh process: first layout of "↩" at 11 pt medium 8.8 to 11.2 ms, "⌘" 0.2 to 0.3 ms. The return symbol draws in 0.3 ms once any symbol has drawn, as sidebar and toolbar icons have before Open Quickly opens.

Before	After

Refs #3661