Preparation timeline (e.g. for baking)

[LC7894]

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Please provide a concise description of the problem that would be addressed by this feature.

First of all: Thank you for the amazing work on Mealie! I love it and use it as my main recipe manager since a long time.

But there is one thing that is missing for me:
I like to bake bread - often with sourdough. The bread recipes with sourdough often require long resting times which means that I have to plan the whole baking process properly. As an example: Finishing a bread on Sunday at 12:00 requires me to start preparing the sourdough on Saturday at 20.23.
Therefore I would highly appreciate a feature that helps me to calculate the starting time of the preparation and the start time of the different sub-steps of the process by inserting my desired finish time.

It might be complex to implement such a feature, but as this might be the most complex use case, the feature might be helpful for normal recipes as well. It should also cover the requirements "normal" recipes have when it comes to process times.

When implemented, this request could pave the way for this request: #3545 (comment)

Please provide a concise description of the feature that would resolve your issue.

An example for the feature that could resolve the issue can be found on the right on this website (it's in German but I think that you can still get the concept):

(Source: https://www.ploetzblog.de/rezepte/roggenvollkornbrot-mit-spezialquellstueck/id=61f3ba599f05c861ee81fa34)

On the right side you can see the timetable involving all the different steps and process times required to bake the bread. By inserting the finish time, the website calculates when I should start baking the bread and in addition, when I have to do the different substeps. The timing is very important here.

In my opinion the feature would require the following sub-features (using the example above to explain them in more detail):

1. Ability to define "step categories". For example: Step 1-2 of a recipe are needed to produce the sourdough - "Sauerteig herstellen" in the picture. Step 3-7 are needed to produce the soaker - "Quellstück herstellen" in the picture. And so on..
2. Ability to define "process times" and "resting times". For example: The category "Sauerteig herstellen" takes 5min, the category "Quellstück herstellen" needs 12h (or 5min process time and 12 hours resting time). And so on.
3. Ability to define which steps are dependent on each other and which steps can be done in parallel. For example the category "Sauerteig herstellen" has 12h of resting time but can be done in parallel to the steps in the category "Quellstück herstellen" which also has 12h of resting time.
4. Ability to set the "finish time" and, depending on that variable, calculation of the "starting time" and "sub-step times". For example: In the picture, 12.00 is defined as finish time which means that I would need to start the process at 20.23 on the prior day. In addition, the tool gives me the information that I have to get up at 8.28 on the second day since there is a process step that I need to do then.

Please consider and list out some caveats or tradeoffs made in your design decision

None at this time

Additional Information

• If this is accepted I'm willing to submit a PR to provide this feature
• If this is accepted I'm willing to help maintain this feature
• I'm willing to sponsor/pay a developer to do this work