Speed up GUI object filtering (debounce + incremental row updates)

[phectori]

Summary

Filtering in the Tk GUI felt slow with many objects because each keystroke triggered a full re-filter that re-gridded and re-styled every row. This change improves filtering speed by debouncing the filter and by updating only the rows whose visibility/position/style actually changed.

It seemed only slow in the windows application.

Changes

• Debounce regex filtering in the filter entry so it does not run a full filter run on every keypress.
• Optimize the filtering/layout path to avoid redundant Tk operations:
  • Only hide rows that became invisible
  • Only show/move rows whose grid row changed
  • Only re-apply alternating row styles when changed
  • Early-exit when the filtered result is unchanged