docs(ui): finalize MVP plan structure and de-archaeologize topic docs

MVP web client (Phases 1-30) is complete; reorganize planning + living docs around that.

- PLAN.md kept as the staged MVP record (1-30) with a status block + pointers; removed the 31-36 stages, regression scenarios, and deferred-TODO section (moved out); fixed a stale cross-machine plan path.

- ui/PLAN-finalize.md (new): active web-finalization plan in 8 stages (visual system, a11y, i18n, error UX, PWA, build hygiene, docs, owner manual-QA loop); absorbs former Phases 33 and 35.

- ui/ROADMAP.md (new): post-MVP (Wails, Capacitor, realistic projection, acceptance + regression scenarios) and triaged deferred follow-ups.

- ui/docs/README.md (new): grouped topic-doc index.

- De-archaeologized all 20 ui/docs topic docs + ui/README.md + ui/core/README.md: stripped Phase-N build history, rewritten as current-state; deferred work now points at ROADMAP.md / PLAN-finalize.md. Docs-only; no code change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ui/docs/report-view.md

@@ -1,9 +1,9 @@
-# Report view — Phase 23
+# Report view
 
-The Phase 23 in-game "turn report" view is a single scrollable
-layout with twenty sections, one per array on the FBS `Report`
-table. The route file is the standard two-line wrapper; the
-orchestrator and the per-section components live under
+The in-game "turn report" view is a single scrollable layout with
+twenty sections, one per array on the FBS `Report` table. The route
+file is the standard two-line wrapper; the orchestrator and the
+per-section components live under
 `ui/frontend/src/lib/active-view/report/`.
 
 ## Component layout
@@ -140,7 +140,7 @@ highlight consistent without a second source of truth.
 
 ## i18n namespace
 
-All Phase 23 strings live under `game.report.*`:
+All strings live under `game.report.*`:
 - `game.report.loading` — section loading placeholder.
 - `game.report.back_to_map`, `game.report.toc.title`,
   `game.report.toc.mobile_label` — shell-level strings.