refactor(mastervega): remove Tooltip dependency, show unexplored stars, and use tech-aware habitability

- Remove Tooltip import and onStarHover callback from MasterOfVegaGame; system view now stays closed for unexplored stars until a scout arrives.
- Make VegaStarMap own its Tooltip via attachTo, replacing the removed onStarHover handler.
- Show unexplored stars at all zoom levels (dimmed) so they remain hoverable targets and display an UNEXPLORED tooltip.
- Split out habitableForEmpire from canColonize so the star map and tooltips use the same tech-aware habitability check (planet type + current planetology tech) instead of the static colonizable flag.
- Change starting exploration: only the home system is explored; all other stars remain unexplored until a scout physically arrives.

src/games/mastervega/MasterOfVegaGame.js

@@ -7,7 +7,6 @@
 import * as Phaser from 'phaser';
 import { GAME_HEIGHT, GAME_WIDTH } from '../../config.js';
 import { Button } from '../../ui/Button.js';
-import { Tooltip } from '../../ui/Tooltip.js';
 import { MusicPlayer } from '../../ui/MusicPlayer.js';
 import { getGameSoundtrack } from '../../services/soundtrack.js';
 import { playSound, SFX } from '../../ui/Sounds.js';
@@ -53,8 +52,6 @@ export default class MasterOfVegaGame extends Phaser.Scene {
       console.info(`[MasterOfVega] procedural art for: ${procedural.join(', ')}`);
     }
 
-    this.tooltip = new Tooltip(this, { depth: 70 });
-
     try {
       const { tracks, volume } = getGameSoundtrack(this);
       if (tracks?.length) this.music = new MusicPlayer(this, tracks, volume);
@@ -467,7 +464,6 @@ export default class MasterOfVegaGame extends Phaser.Scene {
 
     this.map = new VegaStarMap(this, this.rules, this.state, this.art, {
       onStarClick: (idx) => this.onStarClick(idx),
-      onStarHover: (idx) => this.onStarHover(idx),
       onFleetClick: (fleet) => this.onFleetClick(fleet),
       blockWheel: () => this.modalOpen,
     });
@@ -580,6 +576,11 @@ export default class MasterOfVegaGame extends Phaser.Scene {
       return;
     }
 
+    // Unexplored systems only get the map's hover tooltip (VegaStarMap owns
+    // it) — the system view stays closed until a scout has actually arrived.
+    const emp = this.state.empires[this.state.humanIndex];
+    if (emp && !emp.explored[idx]) return;
+
     this.openModal((done) => openSystemView(this, this.rules, this.state, idx, this.art, {
       viewerIdx: this.state.humanIndex,
       onChanged: () => this.refreshAll(),
@@ -587,13 +588,6 @@ export default class MasterOfVegaGame extends Phaser.Scene {
     }));
   }
 
-  onStarHover(idx) {
-    if (idx < 0) return;
-    const star = this.state.galaxy.stars[idx];
-    const emp = this.state.empires[this.state.humanIndex];
-    if (!star || (emp && !emp.explored[idx])) return;
-  }
-
   onFleetClick(fleet) {
     if (this.modalOpen || this.busy) return;
     if (fleet.empireIdx !== this.state.humanIndex) return;

src/games/mastervega/VegaLogic.js

@@ -197,11 +197,21 @@ export function colonyGroundDefense(rules, state, colony) {
 
 // Can this empire settle this planet at all?
 export function canColonize(rules, state, e, starIdx, orbit) {
+  if (colonyAt(state, starIdx) && coloniesAt(state, starIdx).some((c) => c.orbit === orbit)) return false;
+  return habitableForEmpire(rules, state, e, starIdx, orbit);
+}
+
+// Whether this planet is within an empire's current colonisation reach —
+// type + hostility vs. current planetology tech — regardless of whether it is
+// already settled. Split out of canColonize so the star map and tooltip's "N
+// habitable" readout can match what the colony screen actually offers instead
+// of just the planet type's static colonizable flag (which ignores tech and
+// made "1 habitable" show even for worlds too hostile to settle yet).
+export function habitableForEmpire(rules, state, e, starIdx, orbit) {
   const planet = state.galaxy.stars[starIdx]?.planets?.[orbit];
   if (!planet) return false;
   const type = rules.planetTypes[planet.typeId];
   if (!type.colonizable) return false;
-  if (colonyAt(state, starIdx) && coloniesAt(state, starIdx).some((c) => c.orbit === orbit)) return false;
   const emp = state.empires[e];
   const spec = rules.species[emp.speciesId];
   if (spec.traits.colonizeAnything) return true;
@@ -383,12 +393,8 @@ export function createGame(rules, opts) {
     colony.factories = rules.economy.startingFactories;
     colony.capital = true;
     state.empires[e].explored[starIdx] = true;
-    // Neighbours are charted from the start — nobody begins truly blind.
+    // Everything else starts unexplored — a scout has to physically arrive
-    for (let i = 0; i < state.galaxy.stars.length; i += 1) {
+    // (see moveFleets' `explored[f.starIdx] = true`) before its details show.
-      if (parsecs(state.galaxy, starIdx, i) <= (rules.economy.baseFuelRange ?? 4)) {
-        state.empires[e].explored[i] = true;
-      }
-    }
     // Starting fleet: a scout and a colony ship, plus difficulty handicap ships.
     const bonus = e === humanIndex ? 0 : diff.aiStartBonus;
     addFleet(rules, state, e, starIdx, [

src/games/mastervega/VegaStarMap.js

@@ -13,11 +13,15 @@
 
 import * as Phaser from 'phaser';
 import { GAME_HEIGHT, GAME_WIDTH } from '../../config.js';
+import { Tooltip } from '../../ui/Tooltip.js';
 import { makeNebula } from './VegaNebula.js';
 import { PARSEC_PX, parsecs, mulberry32 } from './VegaGalaxyGen.js';
-import { reachableStars, coloniesAt, empireColonies, fleetEta } from './VegaLogic.js';
+import {
+  reachableStars, coloniesAt, empireColonies, fleetEta, habitableForEmpire,
+} from './VegaLogic.js';
 import { starFrame } from './VegaArt.js';
 import { buildZoomLadder, DEFAULT_ZOOM_INDEX } from './VegaZoom.js';
+import { describeStarTooltip } from './VegaTooltips.js';
 
 const FONT = '"Julius Sans One"';
 
@@ -65,6 +69,8 @@ export default class VegaStarMap {
 
     ensureSoftDisc(scene, 'vega-soft-disc', 256);
 
+    this.tooltip = new Tooltip(scene, { depth: 70 });
+
     // --- screen-space backdrop
     this.bgLayer = scene.add.container(0, 0).setDepth(0);
     this.nebula = makeNebula(scene, this.bgLayer, {
@@ -178,6 +184,10 @@ export default class VegaStarMap {
       hit.on('pointerover', () => { this.hoverStar = star.idx; this.cb.onStarHover?.(star.idx); });
       hit.on('pointerout', () => { if (this.hoverStar === star.idx) this.hoverStar = -1; this.cb.onStarHover?.(-1); });
       hit.on('pointerup', (p) => { if (!this.dragged) this.cb.onStarClick?.(star.idx, p); });
+      this.tooltip.attachTo(hit, () => {
+        const viewer = this.viewerIdx >= 0 ? this.state.empires[this.viewerIdx] : null;
+        return describeStarTooltip(this.rules, this.state, viewer, star.idx);
+      });
       container.add(hit);
 
       this.starLayer.add(container);
@@ -274,7 +284,10 @@ export default class VegaStarMap {
     const viewer = this.viewerIdx >= 0 ? state.empires[this.viewerIdx] : null;
     for (const s of this.starSprites) {
       const explored = !viewer || viewer.explored[s.star.idx];
-      s.container.setVisible(explored || this.isFarZoom);
+      // Unexplored stars stay visible (dimmed) at every zoom level so there is
+      // always something to hover/click for the UNEXPLORED tooltip and a scout
+      // target — only their name, ring and system contents are hidden.
+      s.container.setVisible(true);
       s.body.setAlpha(explored ? 1 : 0.25);
 
       const cols = coloniesAt(state, s.star.idx);
@@ -394,7 +407,13 @@ export default class VegaStarMap {
 
       // Closest zoom adds the system's contents.
       if (this.isNearZoom) {
-        const habitable = s.star.planets.filter((p) => this.rules.planetTypes[p.typeId].colonizable).length;
+        // "Habitable" here means settleable at the viewer's CURRENT
+        // planetology, not just the planet type's static ceiling — a Radiated
+        // world is colonizable in principle but still shows as 0/1 until tech
+        // catches up, matching what the system view's colonize button says.
+        const habitable = viewer
+          ? s.star.planets.filter((p, orbit) => habitableForEmpire(this.rules, state, viewer.idx, s.star.idx, orbit)).length
+          : s.star.planets.filter((p) => this.rules.planetTypes[p.typeId].colonizable).length;
         if (s.star.planets.length) {
           const sub = this.scene.add.text(
             s.star.x, s.star.y + s.cls.radius * 2.2 + 32,
@@ -533,6 +552,7 @@ export default class VegaStarMap {
   setViewer(idx) { this.viewerIdx = idx; this.rangeDirty = true; this.refresh(); }
 
   destroy() {
+    this.tooltip.destroy();
     this.nebula?.destroy();
     this.bgLayer.destroy();
     this.starfield.destroy();

src/games/mastervega/VegaTooltips.js

@@ -0,0 +1,53 @@
+// Master of Vega — hover-tooltip content, brought over from the civilization
+// game's tooltip system (src/games/civilization/CivilizationTooltips.js) and
+// adapted for the star map. Rendering itself is the shared src/ui/Tooltip.js
+// component; these functions only build the {title, lines} content it wants.
+
+import { COLORS } from '../../config.js';
+import { coloniesAt, habitableForEmpire } from './VegaLogic.js';
+
+// Hover tooltip for a star on the map. `viewerEmp` is the human empire (or
+// null in observer mode, which sees everything). An unexplored star only
+// ever reveals its class — no name, no colonies, no planets — since that is
+// the one thing visible from a distance without a scout in the system.
+export function describeStarTooltip(rules, state, viewerEmp, starIdx) {
+  const star = state.galaxy.stars[starIdx];
+  const cls = rules.starClasses[star.classId];
+  const explored = !viewerEmp || viewerEmp.explored[starIdx];
+
+  if (!explored) {
+    return {
+      title: 'UNEXPLORED',
+      titleColor: COLORS.dangerHex,
+      lines: [
+        { text: `${cls.name} star`, color: COLORS.goldHex },
+        { text: cls.desc },
+        { text: 'Send a scout ship to chart this system.', color: COLORS.mutedHex },
+      ],
+    };
+  }
+
+  const lines = [{ text: `${cls.name} star`, color: COLORS.goldHex }];
+
+  const cols = coloniesAt(state, starIdx);
+  for (const c of cols) {
+    const owner = state.empires[c.empireIdx];
+    lines.push({
+      text: `${owner.name} colony — pop ${c.pop.toFixed(1)}${c.capital ? ' (capital)' : ''}`,
+      color: owner.color,
+    });
+  }
+
+  if (star.planets.length) {
+    // Matches the system view's colonize button: habitable at the viewer's
+    // CURRENT planetology, not just the planet type's static ceiling.
+    const habitable = viewerEmp
+      ? star.planets.filter((p, orbit) => habitableForEmpire(rules, state, viewerEmp.idx, starIdx, orbit)).length
+      : star.planets.filter((p) => rules.planetTypes[p.typeId].colonizable).length;
+    lines.push({ text: `${star.planets.length} world${star.planets.length === 1 ? '' : 's'} · ${habitable} habitable` });
+  } else {
+    lines.push({ text: 'No planets in this system.', color: COLORS.mutedHex });
+  }
+
+  return { title: star.name, lines };
+}