feat!: improving and simplifying the 1D assignment

[hamed-musallam]

• improving and simplifying the 1D assignment to reduce ambiguity and ensure more consistent behavior.
• Assignments will now be handled exclusively at the signal level, rather than at the range level.
• Ranges will generally contain a single signal, except in cases where the user manually edits and another signal under the same range.

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[targos]

@hamed-musallam There's a failing E2E test that's easy to reproduce (just draw where there is no peak):