Fix notification delta truncation and normalize Nightscout URL

[psjostrom]

Summary

• Fix collapsed notification delta text (-0,2 · IOB 1.2U) being truncated — parent layout was wrap_content instead of match_parent
• Normalize Nightscout URL on save: adds https:// if no scheme, strips trailing slash, trims whitespace — matching SugarField's normalizeUrl behavior

Test plan

• Verify collapsed notification shows full delta + IOB text without ellipsis
• Enter Nightscout URL without scheme (e.g. springa.vercel.app) → confirm it saves as https://springa.vercel.app
• Enter URL with trailing slash → confirm slash is stripped
• Enter URL with http:// → confirm scheme is preserved

🤖 Generated with Claude Code

[psjostrom]

Code review

Found 1 issue:

1. Documentation regressions from PR Add documentation site #40. This branch contains an older copy of the docs that was merged as PR Add documentation site #40, but without the review fixes applied during that PR's review. Merging PR Fix notification delta truncation and normalize Nightscout URL #41 will revert those fixes:

   • mkdocs.yml line 56: pymdownx.superfences is listed as a plain extension, removing the Mermaid custom fence config and dropping pymdownx.arithmatex + MathJax JS entirely. On main these were added during PR Add documentation site #40 review.
   • docs/reference/prediction-algorithm.md line 33: says "seconds before now" — on main this was corrected to "minutes before now" (the code uses minutes).
   • docs/data-sources/companion.md line 21: says "18–900 mg/dL" — on main this was corrected to "51–500 mg/dL" during PR Add documentation site #40 review.

   strimma/mkdocs.yml

   Lines 55 to 57 in 6a30d18

   	- pymdownx.details
   	- pymdownx.superfences
   	- pymdownx.tabbed:

   strimma/docs/reference/prediction-algorithm.md

   Lines 32 to 34 in 6a30d18

   	where `t` is seconds before now (negative, so recent readings get higher weights) and `DECAY = 0.35`.

   strimma/docs/data-sources/companion.md

   Lines 20 to 22 in 6a30d18

   	Strimma automatically detects whether the notification shows glucose in mmol/L or mg/dL and converts as needed. Values are validated to be in the physiological range (1.0–50.0 mmol/L / 18–900 mg/dL) — anything outside this is ignored.

   Recommendation: Rebase this branch onto current main (which has PR Add documentation site #40's fixes), or cherry-pick only commit 6a30d18 (the notification + URL fix) onto a fresh branch.

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