tests: Added FlowTests for Tools Entropy Generation and Calc Final Word Flows

[PROWLERx15]

Description

This PR implements end-to-end FlowTests for the Tools Entropy Generation (Image & Dice Roll) and Calc Final Word flows.

Problem or Issue being addressed

The "SeedSigner Views' Edge Crawler" (Summer of Bitcoin Project) identified that the Image Entropy, Dice Entropy, and Calc Final Word flows in tools_views.py previously had zero FlowTest coverage.

Solution

• Image Entropy Flow: Added tests to verify routing from Live Preview to Mnemonic Length selection. Mocked the hardware camera's capture_frame() output by injecting a PIL Image via a before_run hook.
• Dice Entropy Flow: Added tests for both 12-word and 24-word dice entropy generation flows.
• Calc Final Word Flows: Added tests covering all three entropy branches (Finalize with Zeros, Coin Flip Entropy, and Word Selection Entropy).
• Load/Discard Verification: Verified that completing the Calc Final Word flow correctly routes to SeedFinalizeView (Load) and SeedDiscardView (Discard).

Additional Information

The Crawler identified 16 edges in the Tools and Calc Final Word flows that previously had 0% FlowTest coverage. The tests added in this PR successfully cover 100% of the previously untested edges listed below:

Source	Target
ToolsMenuView	ToolsDiceEntropyMnemonicLengthView
ToolsMenuView	ToolsImageEntropyLivePreviewView
ToolsDiceEntropyMnemonicLengthView	ToolsDiceEntropyEntryView
ToolsDiceEntropyEntryView	SeedWordsWarningView
ToolsImageEntropyLivePreviewView	ToolsImageEntropyFinalImageView
ToolsImageEntropyFinalImageView	ToolsImageEntropyMnemonicLengthView
ToolsImageEntropyMnemonicLengthView	SeedWordsWarningView
ToolsCalcFinalWordCoinFlipsView	ToolsCalcFinalWordShowFinalWordView
ToolsCalcFinalWordShowFinalWordView	ToolsCalcFinalWordDoneView
ToolsCalcFinalWordFinalizePromptView	SeedMnemonicEntryView
ToolsCalcFinalWordFinalizePromptView	ToolsCalcFinalWordCoinFlipsView
ToolsCalcFinalWordFinalizePromptView	ToolsCalcFinalWordShowFinalWordView
ToolsCalcFinalWordDoneView	SeedDiscardView
ToolsCalcFinalWordDoneView	SeedFinalizeView
SeedMnemonicEntryView	ToolsCalcFinalWordFinalizePromptView
SeedMnemonicEntryView	ToolsCalcFinalWordShowFinalWordView

---

This pull request is categorized as a:

• New feature
• Bug fix
• Code refactor
• Documentation
• Testing

---

Checklist

I ran pytest locally

• All tests passed before submitting the PR
• I couldn't run the tests
• N/A

---

I included screenshots of any new or modified screens

Should be part of the PR description above.

• Yes
• No
• N/A

---

I added or updated tests

Any new or altered functionality should be covered in a unit test. Any new or updated sequences require FlowTests.

• Yes
• No, I’m a fool
• N/A

---

I tested this PR hands-on on the following platform(s):

• Raspberry Pi OS Manual Build
• SeedSigner OS on a Pi0/Pi0W board
• Emulator

---

I have reviewed these notes:

• Keep your changes limited in scope.
• If you uncover other issues or improvements along the way, ideally submit those as a separate PR.
• The more complicated the PR, the harder it is to review, test, and merge.
• We appreciate your efforts, but we're a small team of volunteers so PR review can be a very slow process.
• Please only "@" mention a contributor if their input is truly needed to enable further progress.

• I understand

---