docs: app title isn't read in TOC
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Issue body
## Situation
In Rockcraft, the title in the TOC isn't reading the Git tag:
<img width="25%" alt="Image" src="https://github.com/user-attachments/assets/6060099e-503a-40ac-b71d-4141649d88d1" />
The code falls back to `dev` only if the Python env can't find `snapcraft.__version__`. In the RTD runner, that value isn't available for unknown reasons.
## Request
- Find out why the RTD env can't access a copy of the Rockcraft source.
- Patch the problem if it's on the Starbase side.
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