Fix mv-sync path; pre-fill PDF display name from filename on upload

- Fix MV_SYNC path: ../tools resolved to /workspace/tools, should be ./tools
  relative to server.mjs entry point
- Pre-populate display name input when file is selected (strips .pdf extension),
  only if the field is currently empty so manual edits are not overwritten

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

public/templates.html

@@ -566,7 +566,7 @@
 			<div class="form-section-label">Upload new PDF</div>
 			<div class="fp-upload-row">
 				<input type="file" id="fp-file-input" accept=".pdf,application/pdf">
-				<input type="text" id="fp-upload-name" placeholder="Display name (optional)" autocomplete="off">
+				<input type="text" id="fp-upload-name" placeholder="Display name" autocomplete="off">
 				<button type="button" class="btn btn-primary btn-sm" id="fp-upload-btn">Upload</button>
 			</div>
 		</div>