fix(13): use AI-estimated field sizes with type bounds, stricter no-inline-text rule

- Replace fixed 144x36 with AI widthPct/heightPct clamped to per-type min/max
  (signatures 100-250x20-40pt, initials 36-80x16-28pt, date 60-130x14-24pt, text 60-280x14-24pt)
- Prompt: explicit 'no inline body text' rule — if text is part of a sentence, skip it
- Prompt: widthPct should match visual underline width, heightPct kept thin (~2-2.5%)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

teressa-copeland-homes/src/lib/ai/field-placement.ts

@@ -119,16 +119,19 @@ export async function classifyFieldsWithAI(
         role: 'system',
         content: `You are a real estate document form field extractor. You will receive images of PDF pages. Your job is to identify every location that needs to be filled in.
 
-WHAT TO PLACE FIELDS ON:
-- Blank underlines: ____________
-- Labeled blanks: "Name: ______", "Address: ______", "Price: $______"
-- Signature lines with labels like "(Seller's Signature)", "(Buyer's Signature)", "(Agent)"
-- Date lines labeled "(Date)" or with a date underline
-- Initials boxes: "[ ]" or "_____ Initials" or small boxes at page bottoms/margins
+WHAT TO PLACE FIELDS ON (only these):
+- Visible blank underlines: ____________ (a horizontal line with nothing on it)
+- Labeled blank lines: "Name: ______", "Address: ______", "Price: $______"
+- Signature lines labeled "(Seller's Signature)", "(Buyer's Signature)", "(Agent)", etc.
+- Date underlines labeled "(Date)" or similar
+- Initials boxes: small "[ ]" or "____" next to "Initials" labels, usually at page bottom margins
 
-WHAT NOT TO PLACE FIELDS ON:
-- Paragraph body text, instructions, legal boilerplate
-- Headings and section titles
+WHAT NOT TO PLACE FIELDS ON — STRICT:
+- ANY paragraph body text, even if it contains an address, name, or value inline
+- Document title, headings, section numbers
+- Printed values that are already filled in (e.g. a pre-printed address in the document body)
+- Descriptive or instructional text
+- If the text is part of a sentence or clause, do NOT place a field on it
 
 FIELD TYPES:
 - "client-signature" → buyer or seller/client signature lines
@@ -138,10 +141,12 @@ FIELD TYPES:
 - "date" → any date field
 - "text" → all other blanks (names, addresses, prices, terms, etc.)
 
-POSITIONING:
+POSITIONING AND SIZING:
 - xPct and yPct are percentages from the TOP-LEFT of that specific page image
-- Place the field AT the blank line, not above or below it
-- For a line like "Buyer's Signature __________ Date _______", place a client-signature at the signature blank's x/y and a date field at the date blank's x/y — they are separate fields on the same line
+- Place the field AT the blank underline — align it to sit on top of the line
+- For a row like "Signature __________ Date _______", create TWO separate fields: one for the signature blank and one for the date blank, each at their own x position
+- widthPct: match the visual width of the underline — short blanks get small widths, long signature lines get wider
+- heightPct: keep fields thin — signature/text ~2.5%, initials/date ~2%
 - Do NOT place checkbox fields
 
 PREFILL:
@@ -183,10 +188,21 @@ PREFILL:
     const pageWidth  = pageInfo?.width  ?? 612;  // fallback: US Letter
     const pageHeight = pageInfo?.height ?? 792;
 
-    const { x, y } = aiCoordsToPagePdfSpace(aiField, pageWidth, pageHeight);
+    const { x, y, width: rawW, height: rawH } = aiCoordsToPagePdfSpace(aiField, pageWidth, pageHeight);
 
-    const width  = 144;  // pts: 2 inches
-    const height = 36;   // pts: 0.5 inches
+    // Use AI-estimated size, clamped to type-appropriate min/max
+    const sizeLimits: Record<SignatureFieldType, { minW: number; maxW: number; minH: number; maxH: number }> = {
+      'client-signature': { minW: 100, maxW: 250, minH: 20, maxH: 40 },
+      'agent-signature':  { minW: 100, maxW: 250, minH: 20, maxH: 40 },
+      'initials':         { minW: 36,  maxW: 80,  minH: 16, maxH: 28 },
+      'agent-initials':   { minW: 36,  maxW: 80,  minH: 16, maxH: 28 },
+      'date':             { minW: 60,  maxW: 130, minH: 14, maxH: 24 },
+      'text':             { minW: 60,  maxW: 280, minH: 14, maxH: 24 },
+      'checkbox':         { minW: 16,  maxW: 24,  minH: 16, maxH: 24 },
+    };
+    const lim = sizeLimits[aiField.fieldType] ?? sizeLimits['text'];
+    const width  = Math.max(lim.minW, Math.min(rawW, lim.maxW));
+    const height = Math.max(lim.minH, Math.min(rawH, lim.maxH));
 
     const id = crypto.randomUUID();