Remove planning badge from inbox issue rows (PAP-9691) (#6269)

## Summary

- Removes the amber "Planning" pill from inbox / issue-list rows in
`IssueRow`
- Updates the focused IssueRow test to assert the badge is no longer
rendered
- Per [PAP-9691](https://paperclip.ing/PAP/issues/PAP-9691): user just
doesn't want to see the badge in list rows

The underlying `issue.workMode === "planning"` data, the issue detail
composer toggle, and the server/plugin/heartbeat work-mode contract
introduced in #5353 are all untouched. Planning mode still functions;
the list-row indicator is just gone.

## Test plan

- [x] `pnpm exec vitest run --project @paperclipai/ui
ui/src/components/IssueRow.test.tsx` (11 passed)
- [ ] Visual: open `/PAP/inbox` with a planning-mode issue assigned and
confirm no amber Planning pill on the row

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Paperclip <noreply@paperclip.ing>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

tests/e2e/planning-mode-visual-verification.spec.ts

@@ -119,7 +119,7 @@ test("captures planning mode UI for desktop and mobile", async ({ page }) => {
 
   await page.goto(`/${companyPrefix}/issues`);
   await expect(page.locator(issueLinkSelector)).toBeVisible();
-  await expect(page.locator(issueLinkSelector)).toContainText("Planning");
+  await expect(page.locator(issueLinkSelector)).not.toContainText("Planning");
   await page.screenshot({
     path: `${screenshotDir}/desktop-planning-row-${timestamp}.png`,
     fullPage: true,
@@ -149,7 +149,7 @@ test("captures planning mode UI for desktop and mobile", async ({ page }) => {
 
   await page.goto(`/${companyPrefix}/issues`);
   await expect(page.locator(issueLinkSelector)).toBeVisible();
-  await expect(page.locator(issueLinkSelector)).toContainText("Planning");
+  await expect(page.locator(issueLinkSelector)).not.toContainText("Planning");
   await page.screenshot({
     path: `${screenshotDir}/mobile-planning-row-${timestamp}.png`,
     fullPage: true,