fix: functionality gaps (#97, #96, #109, #103, #84)

[neonwatty]

Summary

Fixes five UX gaps in the web dashboard and adds pull-to-refresh:

• When you return from creating an issue, especially if it's a draft, you should return to drafts on the index page.  #97 — Navigate to drafts section after creating a draft (was staying on current tab)
• When assigning an issue to a repo, the UX doesn't wait for an OK button, but just automatically assigns. Should we add an OK button as confirmation?  #96 — Add confirmation step to repo assignment (was one-tap-to-create, now select → confirm)
• It feels like newly created issues, when they're assigned to a repo, do not show up in the index page, even when I restart. When I close the browser and reopen it, it doesn't seem to actually show up, but they are created. I can see them in GitHub.  #109 — Fix assigned issues not showing on index (SQLite cache wasn't invalidated after assignment)
• Pagination of issues on the index page for mobile seems to be not present.  #103 — Add infinite scroll on mobile index page (IntersectionObserver, 15-item batches)
• Fix broken pagination on the settings page #84 — Add collapsible "show all N" sections on settings page (repos + worktrees)
• Pull-to-refresh — Touch-gesture refresh on index and settings pages with overscroll-behavior-y: contain

Changes

• 16 files changed, ~900 insertions, ~50 deletions
• New usePullToRefresh hook + PullToRefreshWrapper component
• New refreshAction server action (clears all SQLite cache + revalidates)
• New e2e test for draft assignment → cache invalidation flow
• Review fixes: proper error logging across all catch blocks, stable touch handlers via ref pattern

Test plan

• pnpm turbo typecheck passes (verified, 0 errors)
• pnpm turbo build passes (verified, all routes build)
• Create a draft → verify navigation lands on /?section=unassigned
• Open draft → action sheet → "Assign to repo" → verify two-step select/confirm flow
• After assigning draft to repo, verify new issue appears on index page
• On mobile viewport with >15 items in a section, verify infinite scroll loads more on scroll
• On settings page with >5 repos or worktrees, verify "show all N" collapse/expand
• On mobile, pull down on index page → verify refresh indicator + data refresh
• On mobile, pull down on settings page → verify same behavior
• Run pnpm --filter @issuectl/web test:e2e — all tests pass including new assign test

Closes #97, #96, #109, #103, #84