Add streaming AI SQL drafts and in-editor review

[amalshaji]

Summary

• stream partial SQL from OpenAI, Codex CLI, and Claude Code directly into the query editor's AI draft surface
• keep AI generation independent per query tab so users can continue working and return when a background draft finishes
• preserve the current query while reviewing the AI draft, then explicitly replace, append, or discard it
• let users select part of a query and ask AI to improve only that selection
• keep the editor toolbar, SQL themes, loading state, and scrolling consistent across light and dark modes

Behavior

• partial SQL is visible and read-only while generation is in progress
• the Current / AI draft switch keeps the original SQL available for comparison
• Discard, Append, and Use in editor appear only after the final response arrives
• query execution, formatting, and save actions are disabled while the draft surface is active
• completed background drafts remain scoped to their originating query tab
• OpenCode uses the same draft flow but currently supplies its response as one final chunk

Implementation

• adds a typed whole-query/selection edit scope across React and the Tauri command boundary
• applies completed drafts atomically against the latest query-tab state
• isolates prompt, toolbar, preview, and SQL-application responsibilities
• splits harness discovery/process handling from the Claude, Codex, and OpenCode adapters
• parses provider streams into typed events and preserves fallback final responses

Validation

• bun run check — 174 tests, typecheck, lint, and production build passed
• cargo test ai::providers::harness --lib — 6 passed
• cargo test --manifest-path src-tauri/Cargo.toml --lib — 122 passed, 1 intentionally ignored
• cargo check --manifest-path src-tauri/Cargo.toml passed
• exact Tauri development build verified from the feature worktree with an isolated local store
• thermo-nuclear maintainability review completed with no remaining blockers

Notes

• cargo clippy --lib -- -D warnings remains blocked by pre-existing warnings in unrelated modules; the changed harness modules introduced no reported clippy finding

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	dbcooper	aa2ab82	Commit Preview URL Branch Preview URL	Jul 29 2026, 02:10 PM