feat(catune): log-scale DualRangeSlider, card grid fix, tutorial baseline docs

[daharoni]

Summary

• Replace two separate Rise/Decay ParameterSlider components with a single DualRangeSlider sharing a logarithmic time axis (0.001–3.0s)
• Rise thumb gets adequate visual resolution (~60% of log-scale track) despite its small numeric range
• Fill bar between thumbs shows the actual time gap on the same scale
• Preserves true-value markers (pink diamonds), onCommit, and data-tutorial attrs for driver.js compatibility
• Card grid fix: pack rows to top with align-content: start to eliminate vertical gaps when cards don't fill the grid
• Tutorial updates: document CaTune's three-layer automatic baseline handling (rolling-percentile subtraction, bandpass filter, solver estimate) in theory steps 2 & 9 and advanced steps 2 & 5 — removes misleading claims that baseline drift is unaddressed

Test plan

• Load CaTune, drag both thumbs — verify cross-clamping (decay > rise) works
• Confirm rise thumb has good resolution across left ~60% of track (log scale)
• Demo mode: confirm two pink diamond markers at correct log-scale positions
• Verify tutorial steps targeting [data-tutorial="slider-rise"] and [data-tutorial="slider-decay"] still highlight correctly
• Card grid: no vertical gaps when fewer cards than grid capacity
• Theory tutorial: advance to steps 2 and 9 — read updated baseline text
• Advanced tutorial: advance to steps 2 and 5 — read updated baseline/artifact text
• Confirm CaDecon is completely unchanged

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