fix: add +N pop animations to "Your Tab (Running)" strip

[Copilot]

The "🍺 Your Tab (Running)" stat items (water, trees, charges, metres) incremented every second but never showed the floating +N pop animations present on every other counter — because spawnPop() was never called for them, and .session-tab-item lacked the CSS prerequisites for absolute positioning.

Changes

• styles/scary-features.css — Added position: relative; overflow: visible to .session-tab-item, matching the same pattern used by .counter-box and .impact-stat.
• styles/counter-milestones.css — Added .token-pop--tab colour variant (orange, matching .sti-val).
• src/js/18-scary-features.js:
  • Extracted WATER_PER_COFFEE_L, KWH_PER_CHARGE, CO2_PER_METRE_KG constants to eliminate the duplicated magic numbers between session totals and per-second delta calculations.
  • Added _lastTabPop throttle variable and once-per-second spawnPop() calls for each of the 4 stat items, using calculateEnvironmentalImpact(rate) for per-second deltas — the same approach as the impact stats section in 02-counter.js.

if (now - _lastTabPop >= 1000) {
  _lastTabPop = now;
  const impactPerSec = calculateEnvironmentalImpact(rate);
  [
    { el: waterEl,  val: impactPerSec.waterL / WATER_PER_COFFEE_L },
    { el: treesEl,  val: impactPerSec.treesEquivalent },
    { el: chargeEl, val: impactPerSec.kWh / KWH_PER_CHARGE },
    { el: metresEl, val: impactPerSec.co2Kg / CO2_PER_METRE_KG },
  ].forEach(({ el, val }) => {
    if (!el || val < MIN_TAB_POP_THRESHOLD) return;
    spawnPop(el.closest('.session-tab-item'), '+' + fmtSmall(val), 'token-pop--tab');
  });
}

Summary by CodeRabbit

• New Features

  • Real-time floating pop animations now display per-second environmental impact changes for tracked activities with performance optimizations.

• Style

  • Updated styling for impact animations with enhanced visual appearance and improved positioning.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

Yo, I tell ya, fool! These changes be addin' floating "+N" pop animations to the session-tab environmental impact metrics, ya feel me? The code introduces shared conversion constants and throttles the update mechanism at 1-second intervals. Plus, new orange-styled pop tokens get spawned when them per-second deltas pass the threshold, and layout properties get adjusted for absolute positioning, sucka!

Changes

Cohort / File(s)	Summary
Session-Tab Pop Animation Logic src/js/18-scary-features.js	Added shared conversion constants for coffee, smartphone, and CO₂ metrics. Updated updateSessionTabStrip() to throttle (once per second), compute per-second environmental deltas, apply thresholds, and trigger spawnPop for .session-tab-item elements with formatted increments, fool!
Pop Token Styling styles/counter-milestones.css	New .token-pop--tab CSS class defines orange/accent-2 text color, orange glow via text-shadow, and 0.7rem font size for session-tab pop animation visuals, sucka!
Session-Tab Layout styles/scary-features.css	Updated .session-tab-item styling with position: relative and overflow: visible to support absolutely positioned pop children elements, ya heard?

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• feat: float-up +N pops on all counters + ×10ⁿ scientific notation #85 — Both PRs implement floating "+N" pop animations for impact counters with identical spawnPop logic, throttling patterns, and overflow adjustments, fool!
• feat: growing token rate + floating +N pop animation on total counter #76 — Both PRs add floating "+N" pop animations and related CSS styling for token counter displays, just on different counter elements, sucka!

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly and clearly summarizes the main change: adding pop animations to the tab running strip with specific visual feedback (+N indicators).
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch copilot/fix-plus-number-animation

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (bcd649d) to head (10f8e15).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #97   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          242       242           
  Branches       109       109           
=========================================
  Hits           242       242           

Flag	Coverage Δ
unit	100.00% <ø> (ø)

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[github-actions]

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