V1.3.0: Hollowcrown seed, player visibility rules, initiative rolls, number limits, temp HP

- Hollowcrown: The Rift Between Worlds as its own seed (npm run
  seed:hollowcrown), built from the campaign book: pools, 58 monsters,
  57 NPCs, 28 locations, 72 encounters with rewards, and DM notes. Shared
  seeding logic moved to prisma/seedCampaign.js.
- What players can see: only encounters their own character is in; only
  the pool entries their character holds (plus starting options while
  building); only locations their character has been to; no invite code;
  no gold, inventory or money log of other players' characters. Socket
  events carry ids only and campaign rooms are members-only.
- Encounters have a location; while one is in progress its characters are
  there, and visits are remembered.
- Campaign setting to show players a health bar only for monsters and NPCs.
- Initiative is entered as the d20 roll (1-20) and the bonus is added;
  players can enter their own character's roll.
- Number fields enforce their limits when typing, and the API enforces
  the same limits.
- Temp HP shows on HP bars and absorbs damage before real HP.
- All packages at version 1.3.0.

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

backend/seed-data/aldenfell.js

@@ -300,7 +300,9 @@ const npcs = [
 // Encounters — pre-built (PLANNING) scenes for the beats of the Campaign Book,
 // in book order. BATTLE scenes run in initiative order; QUEST scenes are built
 // around NPCs and an objective.
-//   description — the scene, shown to every player who opens it: no spoilers.
+//   location    — a location's name: where the scene is. Its characters move
+//                 there when it begins.
+//   description — the scene, shown to the players in it: no spoilers.
 //   dmNotes     — DCs, branches and secrets, DM only.
 //   monsters    — [monster name, count, optional display name]; a count above
 //                 one gets "#n" suffixes.
@@ -313,33 +315,33 @@ const npcs = [
 
 const encounters = [
   {
-    name: 'E1 — The Founding Fair', mode: 'QUEST',
+    name: 'E1 — The Founding Fair', mode: 'QUEST', location: 'Highcrown — The Lantern Market',
     description: 'Highcrown’s Lantern Market at the height of the Founding Fair: lantern-strung stalls, contests of strength and skill, minstrels, and strangers from every corner of the kingdom. This is where you meet.',
     dmNotes: 'Character creation happens here (Roll-Your-Character System) — it can be the whole first half of session one. No combat. Let each PC win or lose something small at a stall, and introduce Mireille and Ser Kavan in passing so they are familiar faces by E4. Ends when the chapel bell fails to ring → E2.',
     npcs: ['Mireille Costa', 'Ser Kavan Thorne'],
   },
   {
-    name: 'E2 — The Bell That Wasn’t Ringing', mode: 'QUEST',
+    name: 'E2 — The Bell That Wasn’t Ringing', mode: 'QUEST', location: 'Highcrown — The Founding Chapel',
     description: 'The Founding Chapel’s bell has rung every hour for as long as anyone remembers. It has stopped. A crowd is gathering outside, and someone is asking for volunteers to go in and look.',
     dmNotes: 'No break-in. The bell rope is neatly cut and left coiled; the bell-ringer is missing, not dead; a line of unfamiliar script is scratched inside the bell (Hollow King iconography). DC 13 Investigation finds the rope and script; DC 12 Persuasion/Insight gets the “woman who wasn’t blinking”.\n• E2A investigate immediately: full clues; skip Vault Room 1.\n• E2B distracted first: the guard missed the script; DC 13 Investigation to find it; start at Room 1.\n• E2C talk to the crowd first: three witness accounts, no script lead; E10 Insight later at advantage.\nThe trail leads to the cellar → E3.',
     npcs: ['Ser Kavan Thorne', 'A Frightened Local'],
   },
   {
-    name: 'E3 — Sunken Vaults: The Old Crypt Hall', mode: 'BATTLE',
+    name: 'E3 — Sunken Vaults: The Old Crypt Hall', mode: 'BATTLE', location: 'Hollow Below — The Sunken Vaults (Layer 1)',
     description: 'A long hall of burial niches beneath the chapel, some sealed, some broken open. Something is growling in the dark between the pillars.',
     dmNotes: 'Vault Room 2, the hub (→ Rooms 3, 4, stair to 6). The dog is starving, not vicious: DC 12 Animal Handling or a thrown ration ends it. DC 13 Investigation: the open niches are just old theft. DC 12 Perception finds the locket.',
     monsters: [['Feral Guard Dog', 1]],
     rewards: [{ item: 'Silver Locket', note: 'Room 2 — DC 12 Perception' }],
   },
   {
-    name: 'E3 — Sunken Vaults: The Restless Ossuary', mode: 'BATTLE',
+    name: 'E3 — Sunken Vaults: The Restless Ossuary', mode: 'BATTLE', location: 'Hollow Below — The Sunken Vaults (Layer 1)',
     description: 'Bones stacked floor to ceiling, and an offering box furred with dust. The air is still. Then it isn’t.',
     dmNotes: 'Vault Room 4, a dead end. One or two skeletons rise halfway through the room — ordinary restless dead, not tied to the Hollow King. DC 12 Religion: proper deconsecration would settle them without a fight. DC 13 to open the offering box.',
     monsters: [['Skeleton', 2]],
     rewards: [{ gold: 25, note: 'Offering box — DC 13 to open' }],
   },
   {
-    name: 'E3 — Sunken Vaults: The Bell-Ringer’s Refuge', mode: 'QUEST',
+    name: 'E3 — Sunken Vaults: The Bell-Ringer’s Refuge', mode: 'QUEST', location: 'Hollow Below — The Sunken Vaults (Layer 1)',
     description: 'A side chamber with a bedroll, a cold lantern, and a frightened old man who very much hopes you are who you look like.',
     dmNotes: 'Vault Room 5. The bell-ringer is alive but shaken: he saw “someone who looked like his neighbor, except wrong”. Getting him out is the win — the bell rings again, the fair goes on, nothing is solved.\nRoom 3 (Smugglers’ Cache) is on the way: DC 14 Investigation ties the crates’ sigil to a lender linked to the corrupted house.\nRoom 6 (The Descent) leads to the Root: wrong, cold air. Signal the tone shift; the party can always turn back. → E4.',
     npcs: ['The Bell-Ringer'],
@@ -370,14 +372,14 @@ const encounters = [
     ],
   },
   {
-    name: 'Side Quest — The Smugglers’ Tithe: Tidewatch', mode: 'QUEST',
+    name: 'Side Quest — The Smugglers’ Tithe: Tidewatch', mode: 'QUEST', location: 'Salt Coast — Tidewatch',
     description: 'Tidewatch, the Salt Coast’s largest port: proud, salt-stained, and suspicious of anyone asking questions. Someone is skimming the town’s quiet trade, and the Concord wants to know who.',
     dmNotes: 'Lv 1–3. Mireille hires the party to learn why a cut of Tidewatch’s smuggled goods vanishes before reaching buyers. TRUTH: a Bandit Captain is extorting the smugglers and funnelling the “tithe” to arm one side of the Bramble Marches conflict. Smugglers distrust outsiders. Track a shipment to Smuggler’s Cove → next scene.\nOutcome decides whether Greyford is supplied at E11/E16.',
     npcs: ['Mireille Costa'],
     rewards: [{ gold: 100, note: 'Mireille’s fee — paid in full if it ends quietly' }],
   },
   {
-    name: 'Side Quest — The Smugglers’ Tithe: Smuggler’s Cove', mode: 'BATTLE',
+    name: 'Side Quest — The Smugglers’ Tithe: Smuggler’s Cove', mode: 'BATTLE', location: 'Salt Coast — Smuggler’s Cove',
     description: 'A hidden inlet south of Tidewatch. Lanterns hooded, a longboat drawn up on the shingle, and a crew that was not expecting company.',
     dmNotes: 'Fight, negotiate, or both. The Captain leads from the front (multiattack) and bolts for the boat below half HP. End it quietly (Mireille pays well) or expose where the tithe was headed (pulls the Marches plot forward).',
     monsters: [['Bandit Captain', 1], ['Highcrown Cutthroat', 4]],
@@ -387,13 +389,13 @@ const encounters = [
     ],
   },
   {
-    name: 'Side Quest — The Warden’s Silence: Direwolf Pack', mode: 'BATTLE',
+    name: 'Side Quest — The Warden’s Silence: Direwolf Pack', mode: 'BATTLE', location: 'Greywood — The Old Shrine Sites',
     description: 'The trail to the shrine runs through old growth where the light barely reaches the ground. The forest has gone quiet, and there are eyes between the trees.',
     dmNotes: 'Lv 1–2. The pack is agitated by the shrine, not evil — DC 13 Animal Handling or Nature to back away without a fight. Pack tactics make three wolves the clearest action-economy lesson for a new table.',
     monsters: [['Greywood Direwolf', 3]],
   },
   {
-    name: 'Side Quest — The Warden’s Silence: The Shrine', mode: 'BATTLE',
+    name: 'Side Quest — The Warden’s Silence: The Shrine', mode: 'BATTLE', location: 'Greywood — The Old Shrine Sites',
     description: 'A mossed-over shrine older than the kingdom, split by a crack you could lose an arm in. The missing Warden is standing in front of it. She turns and greets you by name.',
     dmNotes: 'HORROR register — signal it. The Warden was Hollowed after investigating the crack alone: the party’s first, sympathetic Hollowed. DC 15 Insight notices the wrongness (no blink, a repeated phrase) before it acts. Fight, restrain and bring back to Ashwen (hard questions), or it escapes to report back. Either way Ashwen is convinced.',
     monsters: [['Hollowed', 1, 'The Missing Warden']],
@@ -403,7 +405,7 @@ const encounters = [
     ],
   },
   {
-    name: 'Side Quest — Trial of Stone', mode: 'QUEST',
+    name: 'Side Quest — Trial of Stone', mode: 'QUEST', location: 'The Spine — Stonejaw Hold',
     description: 'Stonejaw Hold, a giant clan’s valley in the Spine foothills. The chieftain has heard you out. He does not offer agreement. He offers a trial.',
     dmNotes: 'Lv 2–4. A genuine test of character, nothing sinister. Trials (per PC or shared): non-lethal wrestling with a giant (the Hill Giant here — HP is a “pin” clock, nobody dies); a test of honesty; proving their word is good (retrieve something, deliver a message honestly). Beats: arrive → formal challenge → trial → feast.\nSuccess = standing alliance (Spine Clans track, unlocks E9D and E11C). Failure is not fatal: Korgath offers a second, harder trial.',
     monsters: [['Stonejaw Hill Giant', 1, 'Stonejaw Champion']],
@@ -414,7 +416,7 @@ const encounters = [
     ],
   },
   {
-    name: 'Side Quest — Refugees of the Marches', mode: 'QUEST',
+    name: 'Side Quest — Refugees of the Marches', mode: 'QUEST', location: 'Bramble Marches — The Sorrow Camp',
     description: 'The Sorrow Camp: hundreds of people under canvas just inside the border, and a garrison at Greyford Keep that wants them gone. Food sent for the camp is not all arriving.',
     dmNotes: 'Lv 2–4, the clearest moral-choice quest. No clean villain: the commander is not wrong about the strategic liability, and the refugees have nowhere else to go. Beats: tension between camp and garrison → find who is skimming aid (the Captain’s crew) → confront them → broker, or fail to broker, an arrangement.\nIntroduce a named refugee NPC here — they are at risk at E16B.',
     monsters: [['Bandit Captain', 1, 'Aid-Skimmer Boss'], ['Highcrown Cutthroat', 2]],
@@ -422,7 +424,7 @@ const encounters = [
     rewards: [{ gold: 50, note: 'Recovered aid money — keeping it is a choice the camp will notice' }],
   },
   {
-    name: 'Side Quest — What the Tide Brought In: The Reef', mode: 'BATTLE',
+    name: 'Side Quest — What the Tide Brought In: The Reef', mode: 'BATTLE', location: 'Salt Coast — Tidewatch',
     description: 'A fishing boat washed up empty this morning: sails intact, catch in the hold, crew gone. The fishers will point out the reef. None of them will row you there.',
     dmNotes: 'Lv 2–3, horror-lite. NOT connected to the Hollow King — a deliberate palate-cleanser. DC 13 Investigation on the boat finds claw marks, not violence. Confront it at sea (it swims, the party does not) or lure it to the shallows. Outcome: safe fishing reopens and real goodwill in Tidewatch.',
     monsters: [['Reef Terror', 1]],
@@ -432,21 +434,21 @@ const encounters = [
     ],
   },
   {
-    name: 'Audience — Threndir’s Eyrie', mode: 'QUEST',
+    name: 'Audience — Threndir’s Eyrie', mode: 'QUEST', location: 'The Spine — Threndir’s Eyrie',
     description: 'A hard climb above the snow line, and a cave mouth wide enough to sail a ship into. The dragon inside already knows you are here. He has not moved, and he has not told you to leave.',
     dmNotes: 'A negotiation, not a fight: Threndir wants proof the crown can still be trusted (Persuasion DC 15–18; real evidence from E10 lowers it). He talks first unless attacked. If it goes wrong, add the “Threndir Ashclaw (old copper dragon)” monster to this scene — and remember he is far beyond a low-level party.',
     npcs: ['Threndir Ashclaw'],
     rewards: [{ weapon: 'Threndir’s Fang', note: 'A shed tooth, set in a hilt — given only if he comes to respect them' }],
   },
   {
-    name: 'E9 — The Root: Weeping Passage', mode: 'BATTLE',
+    name: 'E9 — The Root: Weeping Passage', mode: 'BATTLE', location: 'Hollow Below — The Weeping Passage',
     description: 'A long tunnel beneath the Greywood where the walls weep, and the sound they make is almost a voice. Somewhere ahead, very faintly, a bell tolls.',
     dmNotes: 'HORROR register — signal the tone shift. Root Room 2. DC 14 Survival: the dripping is a Hollowed’s footsteps. The Bellcrawler uses Stillness (DC 17 Perception to spot) and mimics the bell to lure the curious.\n• E9A retreat: keep what they learned, full rest before re-entry.\n• E9B push through: the marking here matches the bell script (DC 16 Arcana/Religion).\n• E9C (took E4A): Ressa Vane escorts and reports back — remove her from the scene otherwise.\n• E9D (won Trial of Stone): a Spine guide enters via Room 4.',
     monsters: [['Bellcrawler', 1]],
     npcs: ['Corporal Ressa Vane'],
   },
   {
-    name: 'E9 — The Root: Hollowed Nest', mode: 'BATTLE',
+    name: 'E9 — The Root: Hollowed Nest', mode: 'BATTLE', location: 'Hollow Below — The Root (Layer 2)',
     description: 'A cavern kept unnervingly tidy: bedrolls squared away, boots in a row. Two people sit facing the wall. They stand when you enter, and smile at exactly the same moment.',
     dmNotes: 'Root Room 3. DC 15 Insight before combat. Consider making one a named missing person. Slam hits force DC 12 Wis or frightened for a round; each can whisper one sentence in Vessa’s voice. The letter (DC 14) hints at the corrupted house.',
     monsters: [['Hollowed', 2]],
@@ -456,7 +458,7 @@ const encounters = [
     ],
   },
   {
-    name: 'E9 — The Root: Root Stalker’s Warren', mode: 'BATTLE',
+    name: 'E9 — The Root: Root Stalker’s Warren', mode: 'BATTLE', location: 'Hollow Below — The Root (Layer 2)',
     description: 'The roots in this chamber are as thick as a man’s waist, and they are not growing from anything. One of them shifts when your light touches it.',
     dmNotes: 'Root Room 4, a dead end (optional secret passage to Room 6). DC 14 Perception or its first attack has advantage. Run it as a slow, dreadful stalk: tremorsense, burrow, grasping roots (restrained, DC 14 Str). E9D: DC 13 Survival or it wakes at the entrance.',
     monsters: [['Root Stalker', 1]],
@@ -466,7 +468,7 @@ const encounters = [
     ],
   },
   {
-    name: 'E9 — The Root: Bellcrawler Gallery', mode: 'BATTLE',
+    name: 'E9 — The Root: Bellcrawler Gallery', mode: 'BATTLE', location: 'Hollow Below — The Root (Layer 2)',
     description: 'Narrow ledges over a drop your torch cannot find the bottom of. From three different directions at once, a bell begins to toll.',
     dmNotes: 'Root Room 6. DC 15 Perception to place them; DC 13 Dex on the ledges or fall 2d6. They skitter (bonus-action disengage) and freeze when watched — stealth and dread, not a straight fight. → Room 7, the stair to the Hollow Court: let them see it and turn back.',
     monsters: [['Bellcrawler', 3]],
@@ -476,14 +478,14 @@ const encounters = [
     ],
   },
   {
-    name: 'E10 — The House Unmasked', mode: 'QUEST',
+    name: 'E10 — The House Unmasked', mode: 'QUEST', location: 'Highcrown — The Palace of Aldenfell',
     description: 'Back in Highcrown with a name, a ledger, and a question nobody at court wants asked out loud: what do you do with it?',
     dmNotes: 'The ledger: every shrine “donation” falls three days after a livestock death.\n• E10A confront the house directly: DC 16 Persuasion/Intimidation with proof, DC 20 without.\n• E10B report to the crown, Isolde or Kavan: sets up Act 3 politics; if E9C, Kavan already suspected (trust bump).\n• E10C (E2C + the servant thread): private DC 13 check at advantage → confession and the sealed letter; the house never learns it is suspected. Best route into Act 3.',
     npcs: ['Princess Isolde Veyrmont', 'Ser Kavan Thorne'],
     rewards: [{ item: 'Sealed Letter', note: 'E10C only' }],
   },
   {
-    name: 'E11 — Silence on the Border', mode: 'QUEST',
+    name: 'E11 — Silence on the Border', mode: 'QUEST', location: 'Bramble Marches — Greyford Keep',
     description: 'Greyford Keep. The gate stands open. No smoke from the chimneys, no one on the walls, no bodies. A kettle is still warm on a guardroom stove.',
     dmNotes: 'DC 13 Perception: drag marks — the defenders left. The Smugglers’ Tithe outcome decides rescue vs recovery. E11C (Spine allied): the clans are already here and share Root Stalker migration intel. Remove the Commander from the scene if this is a recovery.',
     npcs: ['Greyford’s Commander'],
@@ -513,7 +515,7 @@ const encounters = [
     monsters: [['The Hollow King’s Shadow', 1]],
   },
   {
-    name: 'E19 — Vessa’s Seat', mode: 'QUEST',
+    name: 'E19 — Vessa’s Seat', mode: 'QUEST', location: 'Hollow Below — The Hollow Court (Layer 3)',
     description: 'A single worn stone seat at the heart of the Hollow Court, and a woman who has been expecting you. She asks you to sit. She says she would like to explain.',
     dmNotes: 'Court Room 4. The party learns the Hollow King’s true nature from Vessa: the imprisoned will of everyone the founders sacrificed — a suppression of many, not a prison for one. DC 16 Insight: she believes what she says. A strong candidate for a negotiated outcome.\nRoot-fiber + seal-stone (DC 15 Arcana, automatic with a Religion-proficient caster) → advantage on the first check at E22. Then E20: the clock turns to Stage 4.',
     npcs: ['Vessa Hollow'],
@@ -526,14 +528,14 @@ const encounters = [
     rewards: [{ item: 'Potion of Greater Healing', quantity: 2, note: 'Going-away gift from whoever stands with them' }],
   },
   {
-    name: 'E22 — The Seal Chamber', mode: 'QUEST',
+    name: 'E22 — The Seal Chamber', mode: 'QUEST', location: 'Hollow Below — The Hollow Court (Layer 3)',
     description: 'A wound in the world, stitched shut long ago, and coming undone one thread at a time. Whatever you came here to decide, this is where you decide it.',
     dmNotes: 'Court Room 5 — the key branch. DC 18 Arcana/Religion reveals the seal is a suppression of many. Optional DC 14 Wis saves vs disorientation.\n• E22A reinforce (DC 18 Arcana/Religion): the Sealed Ending — time bought.\n• E22B break it deliberately: E23 on the party’s terms — the only path to true victory.\n• E22C do nothing: the seal fails anyway; E24–E25 are harder.\nHollowbane is the campaign’s single most significant magic item: legendary growth, starts at level 7.',
     npcs: ['Vessa Hollow'],
     rewards: [{ weapon: 'Hollowbane', note: 'Drawn from the seal itself' }],
   },
   {
-    name: 'E25 — The Last Approach', mode: 'BATTLE',
+    name: 'E25 — The Last Approach', mode: 'BATTLE', location: 'Hollow Below — The Hollow Court (Layer 3)',
     description: 'The final stretch of the Hollow Court, where gravity, light and memory have all stopped agreeing with one another. The things that live here know you are coming.',
     dmNotes: 'A gauntlet of horror-register creatures; whichever faction the party rallied fights alongside them (add those NPCs). Grey Dawn = a disciplined line; Spine Clans = terrain and ritual (collapse passages); Independent = hardest, and entirely theirs. → E26, the Hollow King: build that stat block from DM Secrets, scaled to the party.',
     monsters: [['Root Stalker', 1], ['Bellcrawler', 2]],