[Refactor] use Seed instead of seed_num

[Chaitanya-Keyal]

Description

This PR refactors the seed views to pass the selected Seed object directly to the next view instead of using seed_num.

Previously, almost every view would immediately dereference seed_num to fetch the Seed object from SeedStorage, resulting in redundant lookups. Passing the Seed object itself removes that redundancy and provides a more robust reference to the selected seed, avoiding potential fragility in the future.

The motivation for this change came up while I was working on #785. In that context, it became clear that relying on seed_num is brittle, since it’s only the index of a mutable list. See my comment for details.

Benefits:

• Removes redundant lookups in views
• More robust references to seeds
• Safer against future changes in seed storage (e.g., reordering, new seed types(?))

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This pull request is categorized as a:

• Code refactor

Checklist

• I’ve run pytest and made sure all unit tests pass before submitting the PR

If you modified or added functionality/workflow, did you add new unit tests?

• N/A

I have tested this PR on the following platforms/os:

• Raspberry Pi OS Manual Build