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/README.md

@@ -0,0 +1,60 @@
+# UI client — topic docs
+
+Deeper, topic-based documentation for the Galaxy web/cross-platform UI
+client, beyond what fits in [`../README.md`](../README.md). Each file
+describes how one area works (current state); the staged build history
+lives in [`../PLAN.md`](../PLAN.md), the active web finalization in
+[`../PLAN-finalize.md`](../PLAN-finalize.md), and deferred work in
+[`../ROADMAP.md`](../ROADMAP.md).
+
+## Foundation & platform
+
+- [navigation.md](navigation.md) — routes, the sidebar tabs, and the
+  state-preservation rules across view/tab switches.
+- [storage.md](storage.md) — the `KeyStore` and `Cache` abstractions and
+  their web (IndexedDB) implementations.
+- [game-state.md](game-state.md) — decoding the FlatBuffers report into
+  `GameReport` and the `GameState` / rendered-report stores.
+- [sync-protocol.md](sync-protocol.md) — order-draft sync, turn cutoff,
+  conflict handling, and auto-pause.
+- [events.md](events.md) — the signed push channel and event handling.
+- [calc-bridge.md](calc-bridge.md) — the `pkg/calc` → WASM → TypeScript
+  bridge, with the live function surface and parity rules.
+- [wasm-toolchain.md](wasm-toolchain.md) — building `ui/core` to
+  `core.wasm` with TinyGo.
+- [testing.md](testing.md) — the UI test layers (Vitest + Playwright).
+
+## Auth & lobby
+
+- [auth-flow.md](auth-flow.md) — device keypair, email-code login, and
+  request signing on the client.
+- [lobby.md](lobby.md) — the lobby/game-list UI and membership flows.
+
+## Map & active views
+
+- [renderer.md](renderer.md) — the PixiJS map renderer contract (world
+  model, hit-test, torus / no-wrap).
+- [order-composer.md](order-composer.md) — the order tab and the
+  optimistic order overlay.
+- [report-view.md](report-view.md) — the Reports view.
+
+## Tools & inspectors
+
+- [calculator-ux.md](calculator-ux.md) — the ship-class calculator
+  (design + goal-seek + planet build + reach circles + modernization).
+- [science-designer-ux.md](science-designer-ux.md) — the science
+  designer.
+- [ship-group-actions.md](ship-group-actions.md) — ship-group inspector
+  actions (move, send, upgrade, …).
+- [cargo-routes-ux.md](cargo-routes-ux.md) — cargo-route composition and
+  reach filtering.
+
+## Combat & comms
+
+- [battle-viewer-ux.md](battle-viewer-ux.md) — the battle viewer.
+- [diplomail-ui.md](diplomail-ui.md) — the diplomatic-mail view.
+
+## Localisation
+
+- [i18n.md](i18n.md) — the localisation mechanism and translation
+  bundles.