made tiny updates

supabase/migrations/012_artboard_phase0_columns.sql

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+-- ═══════════════════════════════════════════════════════════════════════════
+-- Migration 012: Phase 0 artboard schema additions
+-- Adds first-class typed columns for canvas position, device preset, artboard
+-- type, isolation metadata, drag-positioning flag, and thumbnail storage URL.
+--
+-- Spec reference: SOURCE-AWARE-CANVAS §3.7 (schema additions for Phase 0)
+-- All changes use IF NOT EXISTS / DO $$ guards for idempotency.
+-- ═══════════════════════════════════════════════════════════════════════════
+
+-- ── artboards: Phase 0 spatial + type columns ─────────────────────────────────
+-- Promote canvas position from metadata_jsonb to proper typed columns so they
+-- can be indexed and compared without casting. Existing artboards keep their
+-- metadata_jsonb values; new columns default to common presets.
+
+ALTER TABLE artboards ADD COLUMN IF NOT EXISTS canvas_x float8 DEFAULT 0;
+ALTER TABLE artboards ADD COLUMN IF NOT EXISTS canvas_y float8 DEFAULT 0;
+
+-- Backfill canvas_x/canvas_y from metadata_jsonb for existing artboards.
+UPDATE artboards
+SET
+  canvas_x = (metadata_jsonb->>'x')::float8,
+  canvas_y = (metadata_jsonb->>'y')::float8
+WHERE
+  canvas_x = 0 AND canvas_y = 0
+  AND (metadata_jsonb ? 'x' OR metadata_jsonb ? 'y');
+
+-- Device preset: which physical screen size preset the artboard was sized for.
+-- Possible values: 'desktop-hd' | 'desktop-4k' | 'laptop' | 'tablet' | 'mobile'
+ALTER TABLE artboards ADD COLUMN IF NOT EXISTS device_preset text DEFAULT 'desktop-hd';
+
+-- Artboard type controls which content renderer is used.
+-- 'route'     → LiveArtboard iframe pointing at a dev-server route
+-- 'isolation' → Isolation artboard wrapping a single component (Phase 3)
+-- 'static'    → Plain static HTML / no React detected
+DO $$ BEGIN
+  IF NOT EXISTS (
+    SELECT 1 FROM information_schema.columns
+    WHERE table_name = 'artboards' AND column_name = 'artboard_type'
+  ) THEN
+    ALTER TABLE artboards ADD COLUMN artboard_type text NOT NULL DEFAULT 'route'
+      CHECK (artboard_type IN ('route', 'isolation', 'static'));
+  END IF;
+END $$;
+
+-- Isolation artboard metadata (populated when artboard_type = 'isolation').
+-- isolation_component: exported symbol name, e.g. "Button"
+-- isolation_file:      workspace-relative path, e.g. "src/components/Button.tsx"
+-- isolation_props:     JSON props object fed to window.__OM_ISO_PROPS__
+ALTER TABLE artboards ADD COLUMN IF NOT EXISTS isolation_component text;
+ALTER TABLE artboards ADD COLUMN IF NOT EXISTS isolation_file      text;
+ALTER TABLE artboards ADD COLUMN IF NOT EXISTS isolation_props     jsonb DEFAULT '{}';
+
+-- Drag-positioning flag: true once the user has manually moved this artboard
+-- by ≥10 world-space pixels. Prevents the auto-arrange algorithm from
+-- overwriting user-chosen positions.
+ALTER TABLE artboards ADD COLUMN IF NOT EXISTS manually_positioned boolean NOT NULL DEFAULT false;
+
+-- Thumbnail URL: Supabase Storage public URL for the JPEG thumbnail captured
+-- when the artboard transitions to 'far' viewport state.
+-- The data URI itself is NEVER written here — only the Storage public URL.
+-- Null until the first thumbnail is successfully uploaded.
+ALTER TABLE artboards ADD COLUMN IF NOT EXISTS thumbnail_url text;
+
+-- Index: quickly find all isolation artboards within a workspace
+CREATE INDEX IF NOT EXISTS artboards_isolation_idx
+  ON artboards (workspace_id, artboard_type)
+  WHERE artboard_type = 'isolation';
+
+-- ── intent_diffs: Phase 5 blocked_reason column ───────────────────────────────
+-- Stores the agent-supplied reason when status = 'BLOCKED' (e.g. "merge conflict
+-- in src/components/Button.tsx — please resolve manually before retrying").
+-- Written by update_diff_status when status = 'BLOCKED'; null otherwise.
+ALTER TABLE intent_diffs ADD COLUMN IF NOT EXISTS blocked_reason text;