fix(timeline-editor): Remove time indicator and fix sequence overlap

Bug Fix #1: Remove Current Time Indicator
- Removed vertical time indicator line (user feedback: didn't look good)
- Deleted .current-time-indicator CSS class
- Removed HTML element from timeline-container
- Cleaner visual appearance without the distracting line

Bug Fix #2: Dynamic Y Positioning to Prevent Overlap
- Sequences now use cumulative Y positioning instead of fixed spacing
- Previously: seqIndex * 80px (fixed spacing caused overlaps)
- Now: Accumulate Y position based on actual sequence heights

Algorithm:
1. Track cumulativeY starting at 0
2. Calculate each sequence height dynamically:
   height = max(70, 20 + numEffects * 30 + 5)
3. Position sequence at cumulativeY
4. Store Y position in seq._yPosition
5. Increment: cumulativeY += height + 10px gap
6. Effects use seq._yPosition + offset
7. Scroll handler uses seq._yPosition for target

Example (3 sequences with different effect counts):
  Before (overlap):        After (no overlap):
  Seq0: y=0, h=70         Seq0: y=0, h=70
  Seq1: y=80, h=120 ✗     Seq1: y=80, h=120
  Seq2: y=160 (hidden)    Seq2: y=210, h=70 ✓

Technical Changes:
- Added cumulativeY tracking variable
- Added sequenceGap = 10px constant
- Sequences store _yPosition property
- Effects use seq._yPosition instead of seqIndex * 80
- Wheel scroll uses sequences[i]._yPosition
- Properly handles varying sequence heights

Result: Sequences never overlap, regardless of effect count

0 files changed, 0 insertions, 0 deletions