Add Query Store server-side filter panel, chips, and pre-filters

[erikdarlingdata]

Summary

• Builds the full server-side Query Store filtering architecture on top of Add Query Store query-text search filter #390's query-text search: users can now stack sp_QuickieStore-style pre-filters that apply before TOP N in all three SQL builders, so target queries are found even when they aren't in the top N by the chosen metric.
• New criteria (three-surface parity — Desktop, MCP, CLI): minimum executions, minimum average duration/CPU per execution (ms, over the selected window — deliberately grid-consistent rather than mirroring the proc's per-interval semantics), query-text exclude, an escape-brackets toggle for literal [ ] _ matching (EF-style bracketed text), and include/ignore lists for query IDs and plan IDs.
• Desktop gains the filter architecture: a collapsible Server Filters panel with transactional Apply, an always-visible chip strip showing every criterion that shaped the fetch (chips are removable and re-fetch), and promotion — column-filter popups offer "Search server" on columns with server equivalents.

Closes #391

Changes

• Core model (QueryStorePlan.cs): nine new QueryStoreFilter properties; ParseIdList (strict: ordered first-seen dedupe, throws naming any bad token); BuildQueryTextSearchPattern gains an escapeBrackets overload (wrap-then-escape, % never escaped, pairs with ESCAPE '\').
• SQL builders (QueryStoreService.cs, QueryStoreService.Grouped.cs): all criteria added to the pre-TOP-N filter mechanism in the flat and both grouped builders, fully parameterized (per-element IN/NOT IN params); thresholds use null-safe > 0 guards and a float-literal multiplication form that avoids a numeric-precision overflow edge; rn = 1 is relaxed when plans are explicitly included so a non-best plan isn't dropped; with everything unset the generated SQL is byte-identical to before.
• Filter-state model (QueryStoreServerFilterState.cs, Core — unit-testable): typed normalizing setters, ordered chip projection, 1:1 BuildFilter(); EscapeBrackets is a pure modifier (no chip, ignored by IsEmpty, always copied).
• Desktop (QueryStoreGridControl.*, ColumnFilterPopup.*, AppSettingsService.cs): panel + chips rows; Search-by commits now flow into the shared filter state as chips; Fetch_Click commits before fetching; Clear clears all server filters and re-fetches; promotion maps Executions/AvgCpu/AvgDuration (measure-preserving; totals deliberately excluded), ids/hashes (Equals), text/module (Contains) with operator validation at click; panel expanded state persisted.
• MCP (McpQueryStoreTools.cs): nine additive get_query_store_top params. CLI (QueryStoreCommand.cs): nine additive options. Malformed id lists error cleanly on both surfaces before any connection attempt.
• Tests: 59 new — escape-mode pattern matrix (including the documented backslash parity limitation), full ParseIdList contract, and the filter-state model (chips, normalization, mapping, coexistence).

Test Plan

• dotnet build PlanViewer.sln -c Debug — no new warnings
• dotnet test — 182/182 (123 existing + 59 new)
• Live end-to-end on SQL Server 2022 / StackOverflow2013: thresholds filter and back-fill pre-TOP-N; include/ignore id lists return exact sets; explicitly included plans survive the rn relaxation; --escape-brackets flips [Users] between literal and character-class matching; text include+exclude compose correctly (empty results ground-truthed against raw Query Store DMVs); stacked filters AND together
• CLI --help shows all nine options; malformed --include-query-ids "1,x,3" exits 1 with a clear message before connecting
• Desktop smoke: panel apply/clear, chip render/remove/re-fetch, Search-by-as-chips, promotion popup (code-verified and compiled; UI not driven — reviewer note: popup widened to 280px for the third button)

Generated with Claude Code