Fix Bird CLI widget: navigation, text wrapping, error handling

[muk2]

Summary

Fixes all issues reported in #56:

• Esc key now works to exit search results and mentions views
• Detail view scrolling with j/k keys
• Node ExperimentalWarning no longer treated as command failure
• Text wrapping for tweets, modals, and status messages
• Reply modal shows which tweet is being replied to
• Small terminal support with absolute minimum modal sizes

Root Causes & Fixes

1. Unable to exit search/mentions (Esc not working)

Root cause: After async results loaded, close_modal() set mode to Normal and is_modal_open() returned false. All key events went to the normal handler, which had no Esc case.

Fix: Added Esc handler in normal mode that clears tweets when Twitter widget is selected. Esc in detail view closes detail first; second press clears tweets.

2. Detail view not scrollable

Root cause: is_modal_open() returned true for detail view, routing events to the modal handler which only handled Esc/Char/Backspace/Enter. Navigation keys were silently swallowed.

Fix: Added scroll offset to TweetDetail and j/k/up/down handlers in the modal event handler when detail view is active.

3. Compose error (Node ExperimentalWarning)

Root cause: Bird CLI stderr contained Node.js ExperimentalWarning lines that were shown as the error message even when they aren't real errors.

Fix: Filter out lines containing ExperimentalWarning from stderr before reporting errors.

4. Text clipped on right side

Root cause: Tweet list used Line (single-line, no wrapping). Long tweets were clipped.

Fix: Truncate tweet text to available width with ... ellipsis. Added Wrap to status messages and search modal.

5. Compose input invisible in small windows

Root cause: Modals used percentage-based sizing that became too small in small terminals.

Fix: New centered_modal() helper with absolute minimum sizes. Placeholder text hints when input is empty.

6. Reply not working / no feedback

Root cause: When tweet_url was None, the reply case silently did nothing.

Fix: Send TwitterData::Error("No tweet selected to reply to") when URL is missing. Reply modal now shows the tweet being replied to (author + text preview).

Files Changed

• src/app.rs — Esc handler in normal mode, detail view navigation, reply error feedback
• src/ui/widgets/twitter.rs — Scroll support, modal layout, text truncation, Node warning filter, reply context display

Test Plan

• cargo fmt — clean
• cargo clippy — zero warnings
• cargo test — 6/6 pass
• cargo build — success
• Manual: search tweets, Esc to clear results
• Manual: load mentions, Esc to exit
• Manual: open detail view, scroll with j/k, Esc to close
• Manual: compose tweet in small terminal
• Manual: reply to tweet, verify context shown

Resolves #56

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