v0.preview.40

v0.preview.40 - 2026-06-16

• Add scoped session permission grants with a subsumption algebra, collapsing batched approval prompts by re-evaluating them against already-granted scopes
• Cycle permission modes with Shift+Tab
• Rename the Default permission mode to Strict and drive permission mode through settings and the protocol
• Rework turn interrupt and steer keys: Ctrl-C interrupts, Ctrl-S steers, and Esc is contextual and also interrupts an active turn
• Keep the active turn alive across a session or model update
• Show a live "still working" timer for quiet long-running tools
• Report context usage as percent used in the status line
• Cap compaction output by the remaining context window
• Harden the safe-command classifier for date, file, tree, and abbreviated git options
• Fix conservative model token budgets
• Remove unsupported OpenAI subscription models
• Remove the leading slash glyph from the empty input prompt