fix(vt): tokenize --title-mode args correctly for fwd parser

[nikolasdehor]

Summary

• fix web/bin/vt to pass --title-mode as separate argv tokens
• switch TITLE_MODE_ARGS from string to array expansion ("${TITLE_MODE_ARGS[@]}")
• keep existing wrapper behavior while preventing token merging bugs
• add integration test to validate argv tokenization (vt-command.test.ts)

Why

Issue #568 reports that vt --title-mode <mode> ... was forwarded as a single argv token ("--title-mode dynamic"), so downstream parsers could not consume it correctly.

Validation

• cd web && pnpm exec vitest run src/test/integration/vt-command.test.ts ✅
• cd web && ./scripts/test-vt-syntax.sh ✅

Notes

Full pnpm run check on current upstream main still fails due unrelated pre-existing merge artifacts/regressions (handled separately in #601).

Closes #568

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[Copilot]

Pull request overview

Fixes web/bin/vt argument forwarding so --title-mode <mode> is passed to the forwarder as two separate argv tokens (instead of a single merged token), matching what downstream parsers expect.

Changes:

• Convert TITLE_MODE_ARGS from a string to a bash array and expand it via "${TITLE_MODE_ARGS[@]}" at all forwarder call sites.
• Update exec_fwd invocations in direct execution and shell-wrapped execution paths to use the array expansion.
• Add an integration test (vt-command.test.ts) that asserts forwarded argv tokenization for --title-mode.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
web/bin/vt	Switches --title-mode forwarding to array-based argv expansion to prevent token merging.
web/src/test/integration/vt-command.test.ts	Adds an integration test that captures forwarded argv and verifies --title-mode is tokenized correctly.

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