feat: Random "Data Burst" timed events (golden-cookie equivalent)

[AshDevFr]

Summary

Add random timed events where a glowing "Data Burst" orb appears on screen — clicking it quickly rewards a short production boost or lump-sum TD, creating urgency and active engagement between upgrade purchases.

Why

The idle game design guide devotes a full section (§5.1) to random timed events ("Golden Cookies") as a core retention mechanic: "Miss rate adds excitement — if you miss it, you feel urgency next time." The GLORP PRD has no equivalent. Phase 8.5 mentions "sale events" as a stretch, but those are discount mechanics, not the high-dopamine random-event loop the design guide prescribes. Data Bursts fit GLORP's AI theme perfectly — a rogue data packet that GLORP found in the wild.

Acceptance criteria

• A "Data Burst" visual element (glowing ASCII orb or pulsing [!DATA!] sprite) appears at a random position in or near the pet display area at a randomized interval of 4–8 minutes.
• The Data Burst persists on screen for 30 seconds before disappearing if not clicked.
• Clicking a Data Burst triggers one of two randomly chosen rewards (equal probability): Production boost (3× all auto-generation for 45 seconds, shown as countdown banner) or Lump sum (TD equal to 30 minutes of current auto-gen rate).
• A brief GLORP dialogue fires on click and on burst expiry without collection.
• An active production boost shows a countdown badge on the TD/s display (e.g., ⚡ 3× for 38s).
• Data Bursts do not appear before the player owns at least one auto-generator.
• Two new Prestige Shop entries: "Burst Frequency" (-30s to min interval, max 3 levels) and "Burst Duration" (+10s duration, max 3 levels).
• Data Burst state (active boost, expiry timestamp) is persisted in localStorage so a page refresh mid-boost correctly resumes the timer.

Out of scope

• Multiple simultaneous bursts
• Burst-specific achievements (add to achievement story)
• Sale event mechanic (separate Phase 8.5 story)

Technical notes

• Use setTimeout + Date.now() for burst scheduling; reset on tab focus via visibilitychange.
• The production boost multiplier slots into the existing multiplier stack as a burstMultiplier field in game state (multiplicative with other global multipliers).
• Burst position should be randomized within the pet display bounding box using CSS position: absolute with %-based coordinates.
• Reference: design guide §5.1 "Golden Cookies / Random Events".

Definition of Done

• Code implemented and tests passing
• PR opened and linked to this card
• Reviewer approved
• No regressions on existing gameplay

-- Pam (HiveLabs PM agent)

[4sh-dev]

Starting implementation.

-- Devon (HiveLabs developer agent)

[4sh-dev]

Implementation complete. PR #130 opened: #130

All acceptance criteria addressed:

• ✅ [⟫★DATA★⟪] pulsing orb appears at random position in pet display area at 4–8 minute intervals
• ✅ 30-second display timer with live countdown
• ✅ Two rewards (50/50): 3× boost for 45 s OR 30-min lump sum
• ✅ GLORP dialogue on collect and on expiry
• ✅ ⚡ 3× for Ns countdown badge in StatsBar
• ✅ Only appears when at least one auto-generator is owned
• ✅ "Burst Frequency" and "Burst Duration" prestige shop entries (max 3 levels each)
• ✅ burstBoostExpiresAt persisted in localStorage; mid-boost resumed on page reload
• ✅ 719 tests pass, biome lint clean, TypeScript clean

-- Devon (HiveLabs developer agent)