feat(sessions): keep full plan accessible after approval

[posthog]

Summary

Once a plan was approved (or rejected), the full plan markdown was unmounted and only the "Plan approved — proceeding with implementation" line remained. This made it impossible to revisit the plan after the fact — a gap Cory flagged when teeing up parallel agents or a master agent to plan what's next.

The plan text itself is already carried on the tool call's rawInput.plan; the renderer was just hiding it. This PR adds a show plan / hide plan toggle next to the status line so the full plan stays one click away (collapsed by default to avoid dominating the turn view).

Changes

• PlanApprovalView.tsx — after approval/rejection, render the status line with a caret + · show plan affordance. Click expands the existing <PlanContent> (full markdown, scrollable, fullscreen button) inline. Pre-approval behavior is unchanged.
• SessionView.tsx — drive-by fix: the offline-prompt PR (fix(sessions): preserve prompt when sending while offline #1971) added a duplicate useConnectivity() call that broke typecheck on main. Removed the redundant declaration. Filed as its own commit on this branch.

Behavior

State	Before	After
Plan pending	Full plan visible	Full plan visible (unchanged)
Plan approved	"Plan approved" line only	"Plan approved · show plan" — click to expand
Plan rejected	"(Plan rejected)" only	"(Plan rejected) · show plan" — click to expand

Test plan

• Approve a plan from a running session — verify the "show plan" toggle reveals the full plan markdown.
• Reject a plan — verify the same toggle works.
• Open the `PlanApproved` / `PlanCancelled` Storybook stories (`ToolCallBlock.stories.tsx`) — verify the toggle renders.
• Confirm pre-approval rendering is unchanged.

---

Created with PostHog Code

[greptile-apps]

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
apps/code/src/renderer/features/sessions/components/session-update/PlanApprovalView.tsx:51-58
The toggle row is a plain `div` (`Flex` renders as a `div`) with an `onClick` but no `role="button"`, `tabIndex`, or keyboard event handler. Keyboard-only users can't tab to it or activate it, and screen readers won't announce it as interactive.

```suggestion
          <Flex
            align="center"
            gap="2"
            className={`px-1 ${canTogglePlan ? "cursor-pointer select-none" : ""}`}
            role={canTogglePlan ? "button" : undefined}
            tabIndex={canTogglePlan ? 0 : undefined}
            onClick={
              canTogglePlan ? () => setIsPlanExpanded((v) => !v) : undefined
            }
            onKeyDown={
              canTogglePlan
                ? (e) => {
                    if (e.key === "Enter" || e.key === " ") {
                      e.preventDefault();
                      setIsPlanExpanded((v) => !v);
                    }
                  }
                : undefined
            }
          >
```

_{Reviews (1): Last reviewed commit: "feat(sessions): keep full plan accessibl..." | Re-trigger Greptile}