feat: per-profile coding prompt behavior override

[Kunde21]

Summary

Adds per-profile overrides for the two coding system-prompt behavior knobs — session title updates and response options — with the account-level setting remaining the default. A profile can override either knob; any knob omitted from the profile inherits the global account default.

Changes

• protocol (packages/protocol): new CodingPromptBehaviorOverrideV1Schema (partial — no per-field defaults, so omit = inherit global) nested as optional codingPromptBehaviorV1 on AIBackendProfileSchema. Adds resolveCodingPromptBehaviorV1WithOverride() and applyCodingPromptBehaviorOverrideToSettings(). A malformed override is dropped via .catch({ v: 1 }) so the profile itself stays valid.
• cli (apps/cli): resolveEffectiveCodingPrompt.ts resolves the selected profile by id (non-throwing) and merges its override over global settings when building the base coding prompt. Built-in / unknown / override-free profiles fall back to the global default — unchanged behavior.
• ui (apps/ui): getProfileCodingPromptBehaviorOverride (read) + buildCodingPromptBehaviorOverrideV1 (save) helpers, and a profile-level "Coding prompt behavior" editor section with two dropdowns, each offering "Use system default" to inherit the account setting. i18n across en + 9 locales.

Verification

• protocol: 1289 unit tests pass; build + typecheck clean.
• cli: 10 unit tests pass (3 new override tests, RED→GREEN); typecheck clean.
• ui: typecheck exit 0; ProfileEditForm suite 18/18 pass (4 existing render suites + 9 new helper tests).

Notes

• Backward compatible: field optional, no migration, no account-settings version bump.
• Non-English locales use English baseline copy for the new keys; translation review is the only outstanding follow-up.

Draft — opening for early review.

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Note

Add per-profile coding prompt behavior override for session title updates and response options

• Adds codingPromptBehaviorV1 as an optional field on backend profiles, allowing each profile to override session title update mode and response options mode independently of account-level defaults.
• Introduces CodingPromptBehaviorOverrideV1Schema, resolveCodingPromptBehaviorV1WithOverride, and applyCodingPromptBehaviorOverrideToSettings in @happier-dev/protocol to validate, merge, and apply per-profile overrides.
• Updates resolveEffectiveCodingPromptPlan in the CLI agent to read the active profile's override and apply it before building the base coding prompt plan.
• Adds two dropdown controls to the profile edit form (ProfileEditForm) for selecting session title update mode and response options mode, initialized from the profile and included in dirty tracking and save payload.
• Adds translation strings for the new settings section across all supported locales.

^{Macroscope summarized e669080.}

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