Undo delay on cancel, stream hide/block, PWA offline support, vesting timeline view

[Ndifreke000]

Summary

Implements four feature requests:

• feat: Add undo delay on destructive actions (cancel stream) #154 — Undo delay on cancel. Confirming "Cancel stream" no longer submits the transaction immediately. It schedules a 10s countdown toast ("Stream will be cancelled in Ns — Undo"), Gmail-style. The stream card and detail page show a "Cancelling…" state during the delay, and navigating away from the stream detail page (unmounting the dialog) aborts the pending cancellation as a safe default. See hooks/use-undo-cancel.ts.
• feat: Add recipient opt-in mechanism for incoming streams #151 — Recipient opt-in (Option A: hide/block). Incoming stream cards get a "…" menu with "Hide stream" and "Block sender". Hidden stream IDs and blocked sender addresses are persisted in localStorage (lib/hidden-streams.ts, hooks/use-hidden-streams.ts) and excluded from the dashboard's lists/counts and the streams page. A "Show hidden streams" toggle on the streams page lets you review and un-hide/unblock. This is the frontend-only option the issue recommended starting with; Option B (contract-level accept_stream()) is left as a follow-up.
• feat: Add PWA support with offline dashboard and cached stream data #150 — PWA support. Added public/manifest.json, a hand-rolled service worker (public/sw.js, no new dependency) that caches the app shell and falls back to public/offline.html, an online/offline indicator in the navbar, a native "Add to Home Screen" install prompt (components/pwa/install-prompt.tsx), and a stale-data banner on the dashboard backed by a localStorage cache of the last successful stream fetch (lib/streams-cache.ts) so the dashboard still renders something useful offline.
• feat: Add calendar/Gantt view for visualizing vesting schedules #149 — Calendar/Gantt view. Added a List/Timeline toggle on the streams page (preference persisted in localStorage). Timeline mode (components/streams/stream-gantt-view.tsx) renders each stream as a horizontal bar from start to end, with a cliff marker, a shared "today" line across all rows, a hover tooltip (amount, counterparty, % unlocked), status color-coding, and horizontal scroll on narrow viewports.

Notes / TODOs

• The manifest only reuses existing app icons (icon.svg, apple-icon.png, 32×32 PNGs) — no image-processing tooling was available in this environment to generate dedicated 192×192/512×512 PNG icons or iOS splash screens. Recommend adding those as a follow-up for full Android/iOS install compliance.
• Push notifications for stream events (mentioned in feat: Add PWA support with offline dashboard and cached stream data #150's proposed solution) are not implemented — out of scope for this pass.
• This was implemented quickly per the repo owner's request to prioritize opening the PR; no build/lint/test run was performed. Please run CI and review before merging.

Test plan

• Cancel a stream, confirm the countdown toast appears and clicking Undo aborts it (stream stays active, card leaves "Cancelling…" state)
• Let a cancel countdown expire and confirm the stream actually cancels with the normal success toast
• Hide an incoming stream from its card menu, confirm it disappears from the dashboard and streams page, then use "Show hidden streams" to un-hide it
• Block a sender and confirm existing + future streams from that address stay hidden
• Load /manifest.json and confirm the service worker registers (DevTools > Application)
• Go offline and confirm the dashboard shows cached streams with the stale-data banner, and the navbar shows the offline indicator
• Toggle to Timeline view on the streams page and confirm bars, cliff markers, the today line, and tooltips render correctly; confirm the preference persists across reloads

Closes #154
Closes #151
Closes #150
Closes #149

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