bug(app): e2e (linux) failing on dev — legacy-new-session and session-timeline-projection specs #238

Contexto

e2e (linux) is currently red on dev itself (confirmed on the latest dev commit, run https://github.com/alltomatos/opencode/actions/runs/34911995346/job/104201311419, and reproduced identically on PR #234's unrelated changes: https://github.com/alltomatos/opencode/actions/runs/34920297428/job/104226783265). It blocks CI on every open PR regardless of what it touches.

Failing specs (deterministic, not flaky)

• packages/app/e2e/regression/legacy-new-session.spec.ts:9 — "redirects a draft to the legacy new-session route"
• packages/app/e2e/regression/session-timeline-projection.spec.ts:131 — "renders comment strips and historical diff summary overflow"

(A third spec, terminal-composer-focus.spec.ts:79, is separately marked flaky in the same run and passes on retry — not part of this issue.)

Scope

Root-cause and fix both specs (or the underlying app behavior they're testing) so e2e (linux) is green on dev again. Playwright artifacts (screenshot/video/trace) are attached to the failing runs above.