Progress bar and steps while generating, loading, opening claims and travelling; saving chip (t30)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/DESIGN.md

@@ -252,6 +252,13 @@ above, including:
     career and come along; buildings stay on their claim and wait (they don't run) until you
     travel back from the notebook's Claims page.
 
+- **Long waits show what's happening (t30, 2026-10-24).** Generating, loading, opening a claim
+  and travelling show the loading overlay with a title, a moving bar and the current step
+  ("Laying rock and ore", "Unpacking", "Building the world"...). Generation runs as steps that
+  give the browser a frame every 30 ms, producing exactly the same world as before. A small
+  "Saving…" chip shows bottom right only when a save takes longer than 150 ms. The owner found big
+  worlds froze on a 0% bar with no sign of progress.
+
 - **Clay bricks come from a Brick press (t28, 2026-10-24).** A hopper block like the Saw: every
   8 clay lumps on top become a Green brick below, and a Green brick fires into a Brick above about
   900°C (any fire). 2 Bricks build a brick wall block; builders order them. The owner found it odd

docs/PROJECT_MAP.md

@@ -324,9 +324,9 @@ Weather: clouds from steam, rain and snow, and the world water count.
 simTick: one simulation step, in order.
 - functions: simTick
 
-### src/sim/worldgen.js (326 lines)
+### src/sim/worldgen.js (344 lines)
 World generation: noise, layers, ores, caves, water, trees, and clearing tiny hard specks.
-- functions: makeNoise, fbm, clearHardSpecks, generateWorld
+- functions: makeNoise, fbm, clearHardSpecks, generateWorld, generateWorldAsync
 - variables: SPECK_MIN
 
 ### src/sim/save.js (126 lines)
@@ -376,19 +376,19 @@ The title screen art.
 - functions: buildTitleCells, drawTitle
 - variables: FONT5, TITLE
 
-### src/ui/saves.js (212 lines)
+### src/ui/saves.js (224 lines)
 Saves in IndexedDB, world files (export / import) and the blueprint library.
 - functions: newWorldId, worldWrite, listWorlds, putWorldEntry, worldNewest, deleteWorld, cleanWorldName, renameWorld, migrateWorlds, saveWorld, newestSave, b64FromBytes, bytesFromB64, gz, packBuffers, unpackBuffers, exportWorld, importWorldFile, libLoad, libSave, bpEncode, bpValid, bpDecode
-- variables: DB, worldIdTime, worldIdCounter, worldWrites
+- variables: DB, worldIdTime, worldIdCounter, worldWrites, savingCount
 
-### src/ui/claims.js (141 lines)
+### src/ui/claims.js (145 lines)
 Shared player state; the world save remains a complete standalone fallback.
 - functions: careerState, validCareer, applyCareerState, loadCareer, claimName, openNewClaim, travel, renderClaimsTab
 - variables: career, claimBusy
 
-### src/ui/session.js (133 lines)
+### src/ui/session.js (157 lines)
 Starting, loading and quitting a game; modal dialogs; the pause menu.
-- functions: showLoading, enterGame, setupNewWorld, startNewWorld, startFromSave, quitToTitle, refreshContinue, anyModal, openModal, closeModal, closeAllModals, topModal, dialog, openPause, renderWorlds
+- functions: showLoading, enterGame, setupNewWorld, startNewWorld, startFromSave, loadSavedWorld, quitToTitle, refreshContinue, anyModal, openModal, closeModal, closeAllModals, topModal, dialog, openPause, renderWorlds
 
 ### src/ui/settings.js (124 lines)
 The settings screen.
@@ -442,7 +442,7 @@ Previews drawn under the cursor: build ghosts, drill aim and pulses, selections,
 Events from the simulation (emit) turned into sounds, toasts and cards.
 - functions: drainEvents
 
-### src/ui/loop.js (126 lines)
+### src/ui/loop.js (127 lines)
 The frame loop and boot.
 - functions: scanVisible, frame, boot
 - variables: lastT, acc, lastRender, frameMs, simMs, fpsSm, ambientT

docs/agent-log.md

@@ -4,6 +4,19 @@ What agents have done, newest first. Add an entry for every piece of work: the d
 note or request it was for, what changed, the files touched, the tests run, and anything left
 open or not verified. Keep each entry short; the git history has the details.
 
+## 2026-10-24: t30: progress while generating, loading and saving (Claude Code, Codex)
+
+- `worldgen.js`: `worldSteps` generator yields `[fraction, label]`; `generateWorld` (sync, tests)
+  and `generateWorldAsync` (yields every 30 ms) run it. Small and Medium mat/temp/flags hashes
+  match the old generator exactly.
+- `session.js` `showLoading(on, p, label, title)` with `#loadstep`; `GAME.loading` stops the
+  frame loop's sim and drawing while worlds swap. `loadSavedWorld` for Continue and the world
+  list; `worldNewest`/`unpackBuffers`/`startFromSave` report progress; travel and new claims too.
+  `#saving` chip after 150 ms of saving.
+- Tests: t_world progress labels and identical worlds; play.py overlay, responsiveness during
+  async generation, Continue labels, saving chip. All pass except t_smooth half-resolution
+  (fails under load, as before). Screenshots `shots/t30-loading.png`, `shots/t30-saving.png`.
+
 ## 2026-10-24: t3 follow-up: claim names; t30 added (Claude Code, Codex)
 
 - New claims get a camp name from their seed ("Cinder Gulch"; `claimName` in `src/ui/claims.js`,