[GUI] Batch processing queue

[KedoKudo]

Summary

Add batch processing support for multiple TPX3 files with a queue view.

Context

Users processing multiple files need to queue them for sequential or parallel processing with consistent parameters.

Requirements

• Add multiple files to processing queue
• Queue view showing file names, status, progress
• Apply same clustering/extraction parameters to all files
• Batch export to HDF5 (one file per input, or combined)
• Cancel individual items or entire queue
• Summary statistics after batch completion

UI Concept

┌─ Batch Queue ─────────────────────────────┐
│  File                  Status    Progress │
│  sample_001.tpx3       ✅ Done   100%     │
│  sample_002.tpx3       🔄 Processing 45%  │
│  sample_003.tpx3       ⏳ Pending  -      │
│  sample_004.tpx3       ⏳ Pending  -      │
│                                           │
│  [Add Files] [Clear] [Start] [Cancel All] │
└───────────────────────────────────────────┘

References

• Deferred from [ENHANCEMENT] Improve GUI for neutron imaging and detector development #13