Add weight visualization for file_editor

[shashaka]

I implemented weight visualization for the saved file format using HTML and CSS. By default, all weights are displayed along the last axis, as I intended to represent the features. However, when the feature size is large, processing can take considerable time. To address this, I added a threshold for the display size of each grid.

here is my gist

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 1.47059% with 67 lines in your changes missing coverage. Please review.

Project coverage is 57.50%. Comparing base (577ef63) to head (5caa280).

Files with missing lines	Patch %	Lines
keras/src/saving/file_editor.py	1.47%	67 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (577ef63) and HEAD (5caa280). Click for more details.

HEAD has 6 uploads less than BASE

Flag	BASE (577ef63)	HEAD (5caa280)
keras	4	1
keras-torch	1	0
keras-tensorflow	1	0
keras-jax	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #20288       +/-   ##
===========================================
- Coverage   78.88%   57.50%   -21.38%     
===========================================
  Files         511      511               
  Lines       48735    48800       +65     
  Branches     8982     8993       +11     
===========================================
- Hits        38443    28064    -10379     
- Misses       8437    18926    +10489     
+ Partials     1855     1810       -45     

Flag	Coverage Δ
keras	57.50% <1.47%> (-21.24%)	⬇️
keras-jax	?
keras-numpy	57.50% <1.47%> (-0.08%)	⬇️
keras-tensorflow	?
keras-torch	?

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