feat(mobile): read the per-language settings from get-language-state (M-08)

[navidshad]

What

get-language-state now returns newPhrasesPerDay (default 20), poolChunkSize, poolAgeCutoffDays and goals for each language (#134).

• The phone already read newPhrasesPerDay from each summary, so Me → "New phrases a day" now shows the current value on dev.
• The choices were 3, 5, 8, 10 and 15, so the server's default of 20 was never ticked. The list now has 20 and 30, and always includes the current value (one set on the web too).
• LanguageSummary also keeps poolChunkSize, poolAgeCutoffDays and goals.
• The fake server returns the four fields, and saves newPhrasesPerDay and goals.

Tests

• flutter test (app) 88 pass. The Me test now checks that "20" shows and is ticked, and that picking 5 updates the row.
• dart test (api) 64 pass, reading all four fields. The opt-in live test now also checks them against a real server.
• flutter analyze clean.

🤖 Generated with Claude Code

[github-actions]

🎉 This PR is included in version 1.3.0-dev.27 🎉

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