fix(clients): dedupe skills in composer menus

[Adamulek123]

What Changed

• Collapse enabled provider skills by case-insensitive name before building composer menu rows.
• Preserve the provider's first resolved definition and the order of unrelated skills.
• Apply the same rule to / and $ menus on web and mobile.
• Add regression coverage for duplicate names separated by another skill.

Why

Codex can report the same skill name from both .codex and .agents. The composer rendered every definition with the same row ID, so duplicate rows highlighted together. Hovering a later duplicate also scrolled the menu to the first row with that ID, skipping entries between them.

Skill invocation is name-based, so multiple same-name rows are not independently selectable. Keeping one row per name makes the menu match what the user can invoke and restores one-to-one highlight and scroll targets.

UI Changes

Before	After

The after image uses the same duplicated .codex and .agents skill setup. Each skill now has one row and one hover target.

Validation

• vp test run packages/client-runtime/src/providerSkills.test.ts apps/web/src/providerSkillSearch.test.ts (16 tests passed)
• vp run --filter @t3tools/client-runtime typecheck
• vp run --filter @t3tools/web typecheck
• vp run --filter @t3tools/mobile typecheck
• Targeted vp lint and vp fmt on all five changed files
• Integrated desktop verification with the reported duplicated skill directories: Babysit Pr and Branch Audit each render once
• Verified hover moves from Branch Audit to Babysit Pr without highlighting another row or jumping the menu
• Verified the $ skill menu applies the same deduplication
• Latest-head CI and Macroscope correctness, UI consistency, and Effect checks pass

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for the UI change
• No animation or timing behavior changed

Model: GPT-5.6 Sol
Harness: Codex

---

Note

Low Risk
UI-only filtering of already-enabled skills; invocation remains name-based and tests cover first-wins plus disabled-then-enabled duplicates.

Overview
Stops composer / and $ skill menus from listing the same skill twice when a provider reports it from multiple paths (e.g. .codex and .agents). Duplicate names used the same row ID, so hover/highlight jumped between copies.

Adds dedupeProviderSkillsByName, which keeps the first enabled definition (case-insensitive) and order of other skills. Slash menus go through getProviderSkillsForSlashMenu; web $ search and mobile $ menus apply the same helper.

^{Reviewed by Cursor Bugbot for commit eb99052. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Dedupe skills by name in composer slash menus and searchProviderSkills

• Adds dedupeProviderSkillsByName to providerSkills.ts, which keeps only the first occurrence per case-insensitive, trimmed skill name.
• getProviderSkillsForSlashMenu and searchProviderSkills now dedupe enabled skills before returning or ranking them.
• Updates ThreadComposer.tsx to use getProviderSkillsForSlashMenu(..., true) for skill menu items and dedupeProviderSkillsByName for enabled skills in the skill-trigger branch.
• Behavioral Change: slash menus and skill search now show at most one enabled skill per name; the first encountered definition wins.

^{Macroscope summarized eb99052.}

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[macroscopeapp]

Approvability

Verdict: Would Approve

Macroscope's review found this PR approvable — This is a small, self-contained composer-menu bug fix: enabled skills are filtered before case-insensitive name deduplication, removing duplicate rows without changing provider or server behavior. The listed medium finding concerned a disabled-before-enabled duplicate, which the current head addresses and covers with regression tests.

Not approved because:

• 1 blocking correctness issue found at or above your repo's Minimum Blocking Severity

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