feat(editor): add WSPM (Spell Persistent Marker) — 104th open format

Novel replacement for the SpellAreaTrigger.dbc +
AreaTriggerCreateProperties pair vanilla used for AoE
ground decals. Each entry binds one spellId to a
ground-tracked decal: texture path, radius (in yards),
duration, damage tick interval, RGBA decal color, edge-
fade rendering mode (Hard / SoftEdge / Pulse), stack
flag, and destroy-on-cancel semantics for channeled
spells.

The catalog covers three distinct gameplay surfaces in
one shape: player-cast AoE (Blizzard, Flamestrike, etc.
that the visual effects pipeline spawns at cast time),
boss-arena hazard zones (Putricide poison pool,
Sindragosa frost tomb, Marrowgar Bone Storm radius
that raid encounters need to render so players know to
move), and persistent environmental effects
(Wintergrasp lightning strike, Silithus sandstorm cone
that the weather system spawns).

Three preset emitters one per surface: makeMageAoE
(Blizzard/Flamestrike/BlastWave/FrostNova), makeRaid-
Hazards (5 ICC encounter zones), makeEnvironment (3
weather/world hazards). Hazard variants set
destroyOnCancel=0 since they persist beyond any caster;
environment variants additionally set stackable=1 since
multiple lightning strikes can overlap.

Validator's most novel check is spellId uniqueness —
multiple WSPM entries binding the same spellId would
make the spell-cast lookup ambiguous (which decal does
the spell spawn?). Also catches empty texture paths
(decal would render solid color), radius<=0 (zero area),
tickIntervalMs<100ms (perf risk for stackable markers),
decalColor alpha=0 (invisible), and edge-fade enum
range.

Format count 103 -> 104. CLI flag count 1148 -> 1153.

tools/editor/cli_list_formats.cpp

@@ -128,6 +128,7 @@ constexpr FormatRow kFormats[] = {
     {"WEMO", ".wemo",  "social",    "EmotesText.dbc + EmotesTextSound", "Emote definition catalog (/dance, /wave, etc.)"},
     {"WBAB", ".wbab",  "spells",    "Spell.dbc nextRank/prevRank ptrs",  "Buff & Aura book — long-duration class buffs with rank chains"},
     {"WTBD", ".wtbd",  "guilds",    "guild_member tabard config blob",   "Tabard design / heraldry catalog (3-color)"},
+    {"WSPM", ".wspm",  "spellfx",   "AreaTrigger.dbc + decal blob",      "Spell persistent marker catalog (AoE ground decals)"},
 
     // Additional pipeline catalogs without the alternating
     // gen/info/validate CLI surface (loaded by the engine