Playtest #5 fixes: hovering enemies, target order, blocking hand-over, 联防 knocked-out, elements, huge-boss hit area, maps, gear icon, phone HUD, 至简 price

- #1 近地悬浮 enemies count as air units (Unit.isFlying): ground-only attacks, splash, terrain and traps skip them;
  PRTS 不可对空 skill effects made ground-only; 掠海漂移体 / 吉兆飞鳞 drop modes; the bot plans them as air
- #2 an operator knocked out before 联防 is fielded and force-exited (PRTS 强制退场): it lies on its tile with the
  redeploy ring and redeploys (full timer [ASSUMED]); partners, observers and the server fallback included
- #3 element audit of every operator, item and enemy: 海嗣 numbers are official; bursts are 无来源, 元素脆弱 only
  raises 元素伤害, 元素抗性 applied, 盟约·辅助干员 fills all three gauges, 菲莱 / 哈洛德 / 纯烬 / enemy kits fixed
- #4 blocking by the official contact radius (0.7071): another operator in contact takes over at once when the
  blocker dies, withdraws or is stunned; melee blockers attack what they block
- #5 enemy target order per PRTS 索敌: blocker, special priority, taunt, last deployed; initial deploy 从上到下>从左到右,
  operators before summons; special priorities break ties by taunt then deploy order
- #6 act2 m01's normal-field blower machines (row 13) are drawn in the normal / 联防 views
- #7 Final Assault prep legality reads the player's half of the boss field (fence tiles deployable); all 11 stages
  audited against the official level files
- #8 regular settings gear; #9 the prep camera keeps the bench and temp rows clear of the shop bar on phones
- #10 huge bosses have the official 4.95 × 2.95 hit area (sim/body.js) and are 自缚 / unblockable
- #11 至简 costs 1: 购买价格为N's bb.price is a discount off the tier price, applied before other price effects
- DESIGN §19 and the normative §3 / §5 / §6 / §7 lines, SIM / META / DATA / PLAYING updated; 2595 unit tests and
  every browser suite green; dev recordings regenerated

public/js/ui/fallbackField.js

@@ -13,13 +13,15 @@
 // like the official client and exactly where the render engine puts them (gameLogic penPlacement = render/pen.js
 // layoutPen: rows 14–18 × cols 7–13, upper gate rows 17–18, lower gate 14–15, row 16 empty, ≤ 50 models, ≤ 3 per tile);
 // tapping one emits pieceClick { enemyKey, preview: true, unit: { side: 'enemy', defId } }. setCamera('bossPrep') (the
-// Final Assault prep) keeps the own board here — every coordinate the UI exchanges is a board coordinate anyway.
+// Final Assault prep) keeps the own board layout here — every coordinate the UI exchanges is a board coordinate anyway —
+// but draws the tiles of the player's half of the boss field (gameLogic fieldTile, the legality the highlights use: act2
+// m01's fence tiles are floor there, not the normal field's walls; user playtest #5 item 7).
 
 import { render } from '../../vendor/preact.module.js';
 import { html, TierChip } from './components.js';
 import { GEO } from '../../../shared/constants.js';
 import { chessAvatarUrl, itemIconUrl, tokenAvatarUrl, enemyIconUrl } from './assetUrls.js';
-import { tileKey, hasFlag, UF, penPlacement, PEN } from './gameLogic.js';
+import { tileKey, hasFlag, UF, penPlacement, PEN, fieldTile } from './gameLogic.js';
 
 const DRAG_PX = 6;
 const DMG_TTL = 900;
@@ -37,6 +39,24 @@ function unitArt(m, info) {
   return null;
 }
 
+/** Look of the stage tile (row, col) on the fallback board (stage coordinates). */
+export function fallbackTileClass(stage, row, col) {
+  const rows = stage?.rows;
+  const glyph = Array.isArray(rows) && typeof rows[row] === 'string' ? rows[row][col] : 'r';
+  const t = stage?.tiles?.[glyph];
+  if (glyph === 'S') return 'gate';
+  if (glyph === 'E') return 'goal';
+  if (!t) return 'void';
+  if (t.tileKey === 'tile_forbidden') return 'void';
+  if (t.height === 'HIGH') return t.buildable === 'NONE' ? 'void' : 'high';
+  if (t.special === 'mire' || glyph === 'm') return 'mire';
+  if (glyph === 'g') return 'smog';
+  if (glyph === 'd') return 'deep';
+  if (glyph === 'i') return 'infect';
+  if (t.buildable === 'NONE') return 'lane';
+  return 'floor';
+}
+
 /**
  * Create the DOM fallback view.
  * @param {HTMLElement} host
@@ -52,7 +72,7 @@ export function createFallbackView(host, opts = {}) {
   host.appendChild(root);
 
   const st = {
-    stage: null, camera: 'prep', rect: { ...GEO.NORMAL_RECT }, side: 'L',
+    stage: null, camera: 'prep', rect: { ...GEO.NORMAL_RECT }, side: 'L', deployField: 'normal',
     mode: 'prep', priv: null, editable: false, canPlace: null,
     field: null, units: new Map(), snapUnits: new Map(), highlight: new Map(), hlGroups: new Map(), held: new Map(), dirs: new Map(),
     drag: null, hoverTarget: null, floats: [], settings: { damageNumbers: true, ...(opts.settings || {}) },
@@ -196,21 +216,10 @@ export function createFallbackView(host, opts = {}) {
   }
 
   // ---- tiles ----------------------------------------------------------------------------------------------
+  // the stage tile a board tile shows: in a boss round's prep the player's half of the boss field (fieldTile)
   function tileClass(row, col) {
-    const rows = st.stage?.rows;
-    const glyph = Array.isArray(rows) && typeof rows[row] === 'string' ? rows[row][col] : 'r';
-    const t = st.stage?.tiles?.[glyph];
-    if (glyph === 'S') return 'gate';
-    if (glyph === 'E') return 'goal';
-    if (!t) return 'void';
-    if (t.tileKey === 'tile_forbidden') return 'void';
-    if (t.height === 'HIGH') return t.buildable === 'NONE' ? 'void' : 'high';
-    if (t.special === 'mire' || glyph === 'm') return 'mire';
-    if (glyph === 'g') return 'smog';
-    if (glyph === 'd') return 'deep';
-    if (glyph === 'i') return 'infect';
-    if (t.buildable === 'NONE') return 'lane';
-    return 'floor';
+    const [r, c] = st.mode === 'prep' ? fieldTile(st.deployField, row, col) : [row, col];
+    return fallbackTileClass(st.stage, r, c);
   }
 
   function dropState(target) {
@@ -369,6 +378,7 @@ export function createFallbackView(host, opts = {}) {
       if (kind === 'pen') { schedule(); return; } // the board keeps its rect for the way back
       if (o && o.rect && Number.isFinite(o.rect.r0)) st.rect = { ...o.rect };
       else if (kind === 'prep' || kind === 'bossPrep' || kind === 'normal') st.rect = { ...GEO.NORMAL_RECT };
+      st.deployField = kind === 'bossPrep' ? (o?.side === 'R' ? 'bossR' : 'bossL') : 'normal';
       if (kind === 'bossPrep') st.camera = 'prep';
       else if (kind === 'unite') st.rect = { ...GEO.UNITE_RECT };
       else if (kind === 'boss') st.rect = { ...GEO.BOSS_RECT };