…cking

Audits and fixes from the 0.1.1 playtest screenshot:

**Tool input field-name fix.** tool_write was failing with
"missing required key filePath" because DeepSeek occasionally emits
snake_case schema fields with camelCase keys in tool_use calls.
All 6 Mac tool wrappers (Read/Write/Edit/Bash/Glob/Grep) now accept
either case via a tolerant pickStr/pickNum/pickBool helper.

**Project folder picker.** Before chat is usable, users now pick a
project folder via the native file dialog. The path persists to
~/.deepcode/settings.json#projectPath and is threaded as `cwd` into
every agent turn (was hard-coded `/`). Sidebar shows the active
project + a ⇄ switch button to re-open the picker.

**Session persistence.** Added Tauri commands session_create +
session_append. mac-agent now creates a JSONL on first turn (id like
2026-05-28-<8hex>) and appends user + assistant messages. Sidebar
refreshes via a sessionEpoch counter on turn_done, so freshly-started
conversations appear in the Today bucket.

**Mid-turn controls locked.** New controlsLocked flag computed from
busy + pendingApproval; mode / model / effort dropdowns all respect it.
Was previously freely switchable mid-turn, which contradicted whatever
the agent loop already had baked in.

**Inspector rail wired.** All 6 rail icons now route to their
respective screens (Plan→Permissions, Sessions, Plugins, Skills, MCP,
About, Settings, cog→Settings). Expand-chevron ‹ still deferred.

**Proper dropdowns** for mode / model / effort — new Dropdown
component renders a click-popover with inline descriptions + meta,
replacing brittle click-to-cycle UX. 5 official modes now surfaced
(default / acceptEdits / plan / dontAsk / bypassPermissions).

**ChatScreen** folded into ReplScreen — the legacy split chat/terminal
view isn't on the new shell. Kept as a stub for symmetry. Bundle
dropped from 673 KB → 345 KB as a side effect (xterm out of the path).

**System prompt** now informs the LLM of the working directory + that
tool schemas are snake_case, so it stops guessing key casings.

Version bumped to 0.1.2 across tauri.conf / both package.jsons / Cargo.
CHANGELOG entry added. All typecheck + 533 tests pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>