Add shell omnibox foundation

docs/tables_frontend_overhaul_implementation_plan.md

@@ -55,6 +55,7 @@ It is intentionally implementation-focused:
 | 2026-03-21 | P2.3 | Completed | Added a shared `RecentTablesState` service backed by browser storage, centralized the recents storage key, and started recording successful table visits from the `Tables` page so later omnibox and rail work has real shared data. |
 | 2026-03-21 | P2.4 | Completed | Added a shared `PinnedTablesState` service with browser persistence, centralized the pin storage key, initialized pin state in the `Tables` page, and added a first live pin/unpin action plus pinned status chips so later omnibox and navigation work have real saved pins to consume. |
 | 2026-03-21 | P2.5 | Completed | Added shared table-context URL types and a serializer, registered the serializer centrally, and started round-tripping table context through `/tables` and `/tools/diagnostics` so direct links restore the selected table and diagnostic cell context instead of relying only on local storage defaults. |
+| 2026-03-21 | P2.6 | Completed | Replaced the dead shell omnibox trigger with a live drawer-backed omnibox foundation that loads critical tables on demand, filters table search results, surfaces pinned and recent table sections from shared state, and exposes slash-command navigation for the core destinations and tooling routes. |
 | 2026-03-21 | P2.7 | Completed | Added shared frontend primitives for app-bar actions, chips, segmented tabs, drawers, inspector sections, and status indicators, wired the shell omnibox trigger onto the new app-bar action primitive, and switched the new pinned-table labels in `Tables` to the shared status-chip primitive so later page work can build on reusable building blocks instead of fresh ad hoc markup. |
 | 2026-03-21 | P2.8 | Completed | Added a shared `TableContextState` service on top of browser storage and the URL serializer, moved the `Tables` page off page-local table selection persistence, and switched diagnostics to the same restore/persist/build-URI flow so table context logic now lives in shared frontend state instead of being reinvented per page. |
 
@@ -83,6 +84,7 @@ It is intentionally implementation-focused:
 - URL serializers only pay off when wired into real pages. Using the shared serializer in both `Tables` and diagnostics now gives the project one verified round-trip path before the larger table-context service lands.
 - The serializer alone is not the reusable boundary. The maintainable seam is a shared context-state helper that owns restore, persist, normalization, and URI-building conventions while pages keep only workflow-specific selection logic.
 - Primitive extraction lands best when one or two live consumers adopt the new components immediately. That keeps the foundation honest without forcing a broad page rewrite just to validate the abstraction.
+- The omnibox foundation does not need the full final interaction model to be useful. A drawer with real table search, real pinned/recent data, and a small slash-command set is enough to validate the shell surface before Phase 3 builds deeper index and inspector flows on top of it.
 
 ## Target Outcomes
 
@@ -375,7 +377,7 @@ Establish the shared shell, tokens, typography, and theme system that every dest
 | `P2.3` | Completed | Recent critical-table visits now persist through a shared app-state service and are recorded from the `Tables` page. |
 | `P2.4` | Completed | Pinned tables now persist through a shared app-state service and can already be toggled from the `Tables` page. |
 | `P2.5` | Completed | Shared table-context URLs now parse and serialize through one helper and are consumed by `/tables` and `/tools/diagnostics`. |
-| `P2.6` | Pending | The shell omnibox is still a placeholder trigger. |
+| `P2.6` | Completed | The shell omnibox now opens a live drawer with table search, pinned tables, recent tables, and slash-command navigation. |
 | `P2.7` | Completed | Shared primitives for chips, tabs, drawers, inspector sections, app-bar actions, and status indicators now exist in reusable components. |
 | `P2.8` | Completed | Table-context restore, persistence, normalization, and URI building now flow through one shared state service used by `Tables` and diagnostics. |