fix: add error logging to applier, session polling, and job card clicks

- job_applier.mjs: stack traces on per-job and browser-level errors
- session.mjs: log pending status and poll count during session refresh
- linkedin.mjs: log warning when job card click fails instead of silent catch

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

lib/linkedin.mjs

@@ -75,7 +75,9 @@ export async function searchLinkedIn(page, search, { onPage } = {}) {
             link?.closest('li')?.click() || link?.click();
           }, jobId);
           await page.waitForTimeout(CLICK_WAIT);
-        } catch {}
+        } catch (e) {
+          console.warn(`    ⚠️ Could not click job card ${jobId}: ${e.message}`);
+        }
 
         // Read title, company, location from detail panel (more accurate)
         const meta = await page.evaluate(({ id, track, excludes }) => {