fix(composer): detect slash-command trigger mid-prompt, not just at line start

[matdac12]

What changed

detectComposerTrigger only recognized / when it was the very first character of the current line (linePrefix.startsWith("/")), while $skill and @path use whitespace-delimited token detection that works anywhere in the text. Typing /command in the middle of a prompt therefore never opened the command/skill menu — only starting the message with it did.

This adds a / branch to the same token scanner the $ trigger uses, in both copies of the logic:

• apps/web/src/composer-logic.ts (web)
• packages/shared/src/composerTrigger.ts (mobile — keeps its slash-model special case, so a mid-prompt /model opens the model picker just like at line start)

Why

Slash commands behave inconsistently with the other two composer triggers: fix the tests $my-skill autocompletes, while fix the tests /review silently does nothing.

Behavior preserved

• Line-start detection is untouched (the existing line-prefix branch still runs first).
• /model <args> on mobile still works via the existing line-prefix branch.
• "/model spark" still yields no trigger (existing test unchanged).
• Tokens merely containing slashes (src/components, https://…) do not trigger, since the token must start with /.

Tests

Added unit tests for mid-prompt /command, bare /, mid-prompt /model (shared), and the non-trigger cases above, in composer-logic.test.ts and composerTrigger.test.ts (the latter previously had no detectComposerTrigger coverage). Full unit suites of @t3tools/web (1769 tests) and @t3tools/shared (323 tests) pass.

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[macroscopeapp]

Approvability

Verdict: Approved 8dab2ca

This is a self-contained bug fix extending slash-command detection to work mid-prompt. The change reuses existing token extraction logic, is well-tested with edge case coverage, and only affects UI autocomplete behavior.

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