feat(vision): prefix consultation tab titles with 'IMAGE - '

When a non-vision model (e.g. GLM) calls consult_vision, the new Kimi
consultation tab now shows 'IMAGE - <question>' instead of the bare
question-derived title, making image-consultation tabs visually
distinguishable from normal conversation tabs.

- Add formatConsultationTitle(question) pure helper (pure.ts): prefixes
  'IMAGE - ' and truncates the question to 80 chars (matching the
  conversation store's TITLE_MAX) with an ellipsis.
- Add setConversationTitle dep to VisionHandoffDeps, wired in the
  extension to the conversation store's setConversationTitle.
- Call it in consultVision BEFORE the turn starts so the title is
  correct from the first moment (the store keeps a non-'Untitled'
  title on first message append). Best-effort: a title-write failure
  logs a warning but does not break the consultation.
- Tests: 4 pure + 2 service (title set + optional-dep graceful).

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