[datlechin]

Summary

• The editor builds its find bar on first show, as NSTextFinder does. A hidden FindPanelHostingView was still laid out on every SourceEditor, and SwiftUI inserting its pickers forced a layout of the whole editor area around them. Opening a connection window drops it from the turn that builds the restored query tab (17 to 19 ms of its own, plus the forced re-layouts). Every other editor (JSON, values, previews) gains the same.
• Oracle's table listings read the partition flag from ALL_TABLES.PARTITIONED and no longer join ALL_PART_TABLES. Counts come from ALL_PART_TABLES in a separate read, only for owners that returned a partitioned table. A failed count read leaves the listing without counts. On 100 schemas of 500 tables, the listing's server time went from 0.73 to 2.77 s to 0.17 to 0.38 s; the count read takes 0.08 to 0.11 s.
• Open Quickly no longer shows "No results" while a listing the sidebar started is still loading.
• A sidebar search asks for a failed or partly unlisted all-schema listing once per search, not on every keystroke.
• The List sidebar layout shows loading, not "No Results", while the other schemas' listing is in flight.

Still over budget (scripts/benchmark/large-catalog/baseline.json):

• The restored query tab's editor still builds in one main-thread turn of 120 to 260 ms (machine load 10 to 56 from other jobs). What remains is visible: the query bar's SwiftUI controls, the SourceEditor, and the results pane.
• Oracle's first sidebar keystroke measured 916 ms with the new plugin at load 13. Its old-plugin run and the full benchmark could not run: the Mac locked.

Test plan

• New: FindPanelTests (built on first show, a term set before then is searched), OracleSchemaQueriesTests (no join, count read, owners, merge), QuickSwitcherListingDemandTests.listingAnotherReaderStartedCountsAsLoading (fails without the fix), SidebarSchemaFilterTests.failedListingIsAskedForOncePerSearch, SidebarObjectListPresentationTests.searchAwaitingTheListingIsNotAMiss.
• Changed on purpose: OracleSchemaQueriesTests.testTableListingReadsPartitioningFromAllPartTables replaced; EditorKeyMonitorCompositionTests, TextViewControllerClippingTests, TextViewControllerTests read the find panel as optional.
• Local: 292 hosted and editor tests, 320 swift test in TableProOracle, 19 iOS Oracle tests; lint clean. verify.sh plugins stopped at DamengDriver (no libdameng_bridge.a here); OracleDriver built on its own.

Refs #3661