feat(bridge): implement presentation-aware handover and robust placeholder resolution

- Upgraded launch_from_cache to automatically trigger LibreOffice/AppleScript launchers after file copy.
- Hardened expandPath to resolve [home] and [tmp] placeholders anywhere in strings via global regex.
- Enhanced get-device-info telemetry to provide absolute home and tmp paths to the UI.
- Exposed native:launch-presentation in preload and implemented explicit LibreOffice (--impress) support on Linux.

src/main/file_handlers.ts

@@ -1,6 +1,8 @@
 import { ipcMain, shell } from 'electron';
 import * as fs from 'fs';
 import * as path from 'path';
+import * as os from 'os';
+import { exec } from 'child_process';
 import axios from 'axios';
 import { expandPath } from './file_utils';
 
@@ -64,8 +66,43 @@ export function registerFileHandlers() {
       const source = get_organized_hashed_path(cache_root, hash, hash_prefix_length);
       const expanded_temp = expandPath(temp_root);
       const target = path.join(expanded_temp, filename);
+      
+      console.log(`Native: Launching from Cache -> ${filename}`);
+
       if (!fs.existsSync(expanded_temp)) fs.mkdirSync(expanded_temp, { recursive: true });
+      
+      // 1. Copy the file to temp folder with original name
       fs.copyFileSync(source, target);
+      
+      // 2. Determine file type
+      const ext = path.extname(filename).toLowerCase().replace('.', '');
+      const is_pres = ['pptx', 'ppt', 'key', 'pdf', 'odp'].includes(ext);
+
+      // 3. Optimized Launch (LibreOffice / AppleScript)
+      if (is_pres) {
+        if (os.platform() === 'linux') {
+          console.log(`Native: Launching LibreOffice (--impress) for ${target}`);
+          return new Promise((resolve) => {
+            exec(`libreoffice --impress "${target}"`, (err) => {
+              if (err) resolve({ success: false, error: err.message });
+              else resolve({ success: true });
+            });
+          });
+        }
+
+        if (os.platform() === 'darwin' && ext === 'key') {
+          console.log(`Native: Launching Keynote via AppleScript for ${target}`);
+          const script = `tell application "Keynote" to open POSIX file "${target}"`;
+          return new Promise((resolve) => {
+            exec(`osascript -e "${script.replace(/"/g, '\"')}"`, (err) => {
+              if (err) resolve({ success: false, error: err.message });
+              else resolve({ success: true });
+            });
+          });
+        }
+      }
+
+      // 4. Default Fallback
       await shell.openPath(target);
       return { success: true };
     } catch (error: any) {