Showed the nation's resource pool in the simple economy's top panel

The top bar now carries a two-by-two grid of the four storable goods, each a big icon, the grouped pool and an arrow reading production against consumption (purchases excluded); hovering a chip names both daily figures. The quantity column reserves room for 99 999 999 999 so the layout never shifts as stocks grow.

formatResourceAmount paired each prefix with a divisor a thousand times too large, so a million tonnes printed as 1 kt; the steps now move together as kt, Mt, Gt and Tt.

client/js/devlog_data.js

@@ -1,6 +1,12 @@
 // Generated by scripts/generate-devlog.js from `git log`; do not edit.
 // The pre-commit hook refreshes it so the main menu shows the latest commits.
 export const DEVLOG = [
+  {
+    "hash": "d5305da",
+    "date": "2026-09-25",
+    "subject": "Gave the world a simple economy: one pool per nation and a global market",
+    "body": "The simple economy is now the default and the old simulation is frozen as the hard model, selectable per game. A nation keeps one resource pool available in every region, fed by public production works rather than private per-region stores, and construction and training begin at once, paced by the region's spare power instead of gathering materials over days.\n\nMoney is euro only: a per-inhabitant daily tax funds a treasury spent in a global market, where buy and sell lots trade against the world stock and move its price. The hard economy keeps its per-nation currencies, central banks and exchange rates.\n\nSimple games skip the price-settling warmup and economic migration; the snapshot carries the economy model, the market and the pool figures the client draws. Added the matching test suites and the design briefs under docs/simple_economy."
+  },
   {
     "hash": "49613f2",
     "date": "2026-09-24",
@@ -54,11 +60,5 @@ export const DEVLOG = [
     "date": "2026-09-23",
     "subject": "Stopped a tile-work rebuild from discarding every cached trade walk",
     "body": "The trade graph's cache stamp mixed in the tile-improvement version, which a mine, mill or plant rebuilt in place bumps many times a day, so every city's sea-lane flood was thrown away and rebuilt. The stamp now keys on the transport network, the territory and the storage-node set alone: over ten days the rebuilds fall from hundreds to the 45 the world needs, and the daily resource tick from about 700 ms to about 150 ms.\n\nThe snapshot path is memoised against the counters that actually move it -- the per-civ headline population and GDP, the per-city building and per-nation government/research modifiers, the port and food bonuses, the road and railway tile counts and the ethnic make-up rebuild only when their version changes; the flattened visible set is cached alongside explored; and the HUD upkeep sums without building the labelled budget breakdown. DELTA_COLLECTIONS had drifted from the snapshot's key names (it listed gdpBaseline while the state ships productionBaseline, and tileEthnicity while the version is ethnicity), so the static baseline was re-sent as JSON on every broadcast; the collection/version pairs are now explicit.\n\nTogether a broadcast falls from roughly 60 ms to 18 ms and the bytes for fifty of them from 57 MB to 24 MB, and 200 in-game hours simulate in about a third of the time. regionTiles caches the per-city owned lists behind the daily economy walks, and supplier reserves read a region's headcount without deriving its GDP; getCityEconomy itself stays uncached outside a snapshot so a simulation read still reflects a direct population edit at once."
-  },
-  {
-    "hash": "8042991",
-    "date": "2026-09-23",
-    "subject": "Made producers pay their own way and settled the world to steady prices",
-    "body": "- The monthly budget breaks each expense into the resource bought, its quantity and the average price paid: tile improvements already did, and now every upkeep row (buildings, units, works, transport) does too.\n- Private producers settle their daily wear from their own cash and borrow the shortfall from the central bank, so their cash never goes negative.\n- Producers fund their own construction and upgrades on the same credit; the treasury pays only for public works, roads and railways, and no private purchase is filed as a public tile-improvement expense.\n- The server settles the world until every commodity holds within 10% over a trailing seven days instead of a fixed 150, capped by --warmup (0 skips it).\n- The shipped month report carries its label again, so the budget header and pager name the month."
   }
 ];