refactor: points rework (v1)

[ClementTsang]

Description

A description of the change, what it does, and why it was made. If relevant (such as any change that modifies the UI), please provide screenshots of the changes:

Rework how time series data is stored, and remove the "conversion" intermediary step. More specifically:

• Frozen state is also reworked and unified under a single DataStore struct.
• We now store data in a SoA format to reduce duplication of time values, with a lot of the time series data logic stored in a separate crate (https://github.com/ClementTsang/timeless)
• Remove the conversion steps and ConvertedData intermediary struct (and remove that altogether); we now have more direct access of the raw data.
• Some other driveby changes:
  • Remove temperature conversion step and do it in data eating.
  • Fix how log values are calculated if 0.

This has the following benefits:

• Lower memory usage (since we're not duplicating as much data anymore)
• Simpler/less code going from intaking data -> displaying data
• A bit less spaghetti around accessing data
• Less spaghetti around time series data

---

TODO:

• Convert time graph draw to take time + chunks
  • Remove temporary point "caching"
  • Remove old glue code
• Optimize table data loading such that it does no additional work
• (maybe separate PR) Optimize table data loading to store references instead
• Check any remaining FIXMEs.
• Profile for any hotspots.

Issue

If applicable, what issue does this address?

Closes: #

Testing

If relevant, please state how this was tested. All changes must be tested to work:

If this is a code change, please also indicate which platforms were tested:

• Windows
• macOS
• Linux

Checklist

If relevant, ensure the following have been met:

• Areas your change affects have been linted using rustfmt (cargo fmt)
• The change has been tested and doesn't appear to cause any unintended breakage
• Documentation has been added/updated if needed (README.md, help menu, doc pages, etc.)
• The pull request passes the provided CI pipeline
• There are no merge conflicts
• If relevant, new tests were added (don't worry too much about coverage)

[codecov]

Codecov Report

Attention: Patch coverage is 30.38585% with 866 lines in your changes missing coverage. Please review.

Project coverage is 42.14%. Comparing base (cf91c73) to head (fb956e2).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/canvas/widgets/network_graph.rs	0.00%	151 Missing ⚠️
src/app/data/store.rs	39.26%	116 Missing ⚠️
src/canvas/widgets/mem_graph.rs	0.00%	101 Missing ⚠️
src/app/data/time_series.rs	31.14%	84 Missing ⚠️
src/canvas/widgets/cpu_basic.rs	0.00%	83 Missing ⚠️
src/canvas/widgets/mem_basic.rs	0.00%	67 Missing ⚠️
src/app/data/process.rs	0.00%	35 Missing ⚠️
src/app.rs	23.52%	26 Missing ⚠️
src/widgets/disk_table.rs	0.00%	25 Missing ⚠️
src/utils/data_units.rs	40.00%	24 Missing ⚠️
... and 23 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1663       +/-   ##
===========================================
- Coverage   53.95%   42.14%   -11.81%     
===========================================
  Files         109      110        +1     
  Lines       17911    17469      -442     
===========================================
- Hits         9663     7363     -2300     
- Misses       8248    10106     +1858     

Flag	Coverage Δ
macos-14	37.80% <12.87%> (+0.44%)	⬆️
ubuntu-latest	43.92% <30.68%> (-12.40%)	⬇️
windows-2019	37.70% <12.75%> (+0.45%)	⬆️

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[ClementTsang]

Note: current #alloc hotspots are AMD gpu and linux processes.