PDF (Hollywood): left margin should be 1.5" (3.81cm), not 3cm

[stultus]

Problem

Hollywood spec calls for a 1.5″ (3.81cm) left margin. Scriptty uses 3cm (~1.18″), which is ~8mm too narrow. Every downstream indent was tuned against the wrong baseline, so dialogue isn't at 2.5″ from paper edge and character cues aren't at 3.7″.

Current state

• src-tauri/src/screenplay/pdf.rs:699 — embedded Hollywood left: 3cm
• src-tauri/src/screenplay/pdf.rs:1546 — standalone Hollywood left: 3cm

Character cue padding pad(left: 6cm), dialogue pad(left: 3.5cm, right: 3cm), parenthetical pad(left: 4.5cm, right: 3.5cm) are all computed relative to the 3cm text box.

Suggested fix

1. Change page margin to left: 3.81cm.
2. Reduce each pad(left: ...) by 0.81cm to preserve the intended positions from the page edge:
   • character cue pad(left: 6cm) → pad(left: 5.19cm)
   • dialogue pad(left: 3.5cm, right: 3cm) → pad(left: 2.69cm, right: 3cm)
   • parenthetical pad(left: 4.5cm, right: 3.5cm) → pad(left: 3.69cm, right: 3.5cm)
3. Update the unit tests in pdf.rs that assert on pad(left: 6cm) etc. (around line 1909+).