… right-click, CRLF)

Fix 6 bugs in client-server mode reported in #118:

1. display-message: handler now sets app.status_message when not using
   -p flag, so messages actually appear on the status bar.

2. Mouse multi-client tracking: all 10 mouse/scroll CtrlReq variants now
   carry client_id. Server updates latest_client_id on mouse events so
   coordinate processing uses the clicking client's dimensions.

3. Popup race condition: added 50ms delay after PTY spawn in display-popup
   so the reader thread can populate the vt100 parser before the first
   frame is serialized to clients. Prevents blank popups with fast commands.

4. Paste fragmentation: added growth detection to stage2 timeout. If the
   paste_pend buffer grew since the last check, the timeout is extended
   instead of splitting the paste. Large non-ASCII buffers (>=20 chars)
   now enter stage2 instead of being flushed as IME input.

5. Right-click copy paste suppression: after right-click copy, text key
   events are suppressed for 2s to prevent VS Code ConPTY from injecting
   duplicate clipboard content as key events.

6. Clipboard CRLF normalization: read_from_system_clipboard() now normalizes
   Windows CRLF line endings to LF, preventing double-spaced paste output.

Also includes the parse_command_line \\\\ escape fix from #123.

Fix 6 bugs in client-server mode reported by @ToxMox in #118:

1. display-message: handler now sets app.status_message when not using
   -p flag, so messages actually appear on the status bar.

2. Mouse multi-client tracking: all 10 mouse/scroll CtrlReq variants now
   carry client_id. Server updates latest_client_id on mouse events so
   coordinate processing uses the clicking client's dimensions.

3. Popup race condition: added 50ms delay after PTY spawn in display-popup
   so the reader thread can populate the vt100 parser before the first
   frame is serialized to clients. Prevents blank popups with fast commands.

4. Paste fragmentation: added growth detection to stage2 timeout. If the
   paste_pend buffer grew since the last check, the timeout is extended
   instead of splitting the paste. Large non-ASCII buffers (>=20 chars)
   now enter stage2 instead of being flushed as IME input.

5. Right-click copy paste suppression: after right-click copy, text key
   events are suppressed for 2s to prevent VS Code ConPTY from injecting
   duplicate clipboard content as key events.

6. Clipboard CRLF normalization: read_from_system_clipboard() now normalizes
   Windows CRLF line endings to LF, preventing double-spaced paste output.

Also fixes parse_command_line backslash escape reported by @schgoo in #123.
The parser now recognises \\ as an escape sequence inside double quotes
(producing a single \), preventing the closing quote from being consumed
when the client sends send-text "\\".

Co-investigated-by: @ToxMox (#118)
Co-investigated-by: @schgoo (#123)

Brings 17 upstream commits into ohboy-builds:
- fix: warm claim race condition (psmux#136)
- fix: client_prefix flag, window_zoomed_flag (psmux#125, psmux#126)
- fix: Shift+Enter/Ctrl+Enter modifiers, paste normalization (psmux#131, psmux#132)
- fix: backslash escape, 6 client-server bugs (psmux#118, psmux#123)
- fix: -f global option (psmux#119)
- fix: set-hook replace/remove, zoomed navigation wrap (psmux#133, psmux#134)
- fix: TERM env var mapping, hyphenated option leak (psmux#137)
- feat: bell/activity/silence monitoring, allow-rename, update-environment
- feat: vim-style bind-key C-hjkl pane navigation (psmux#130)
- feat: XDG plugin path support (psmux#135)
- feat: auto-generate changelog in release workflow
- refactor: move Rust tests to tests-rs/ directory
- refactor: rich test dashboard

Also applies ohboy-builds stashed changes:
- Remove claude-code-fix-tty (Claude Code now auto-detects $TMUX)
- Migrate env::set_var to safe crate::util::set_env wrappers (Rust 1.83)
- Selection clamp to pane boundaries in copy mode
- Fix clippy warnings in forked crates (vt100-psmux, portable-pty-psmux)

Fix 6 bugs in client-server mode reported by @ToxMox in psmux#118:

1. display-message: handler now sets app.status_message when not using
   -p flag, so messages actually appear on the status bar.

2. Mouse multi-client tracking: all 10 mouse/scroll CtrlReq variants now
   carry client_id. Server updates latest_client_id on mouse events so
   coordinate processing uses the clicking client's dimensions.

3. Popup race condition: added 50ms delay after PTY spawn in display-popup
   so the reader thread can populate the vt100 parser before the first
   frame is serialized to clients. Prevents blank popups with fast commands.

4. Paste fragmentation: added growth detection to stage2 timeout. If the
   paste_pend buffer grew since the last check, the timeout is extended
   instead of splitting the paste. Large non-ASCII buffers (>=20 chars)
   now enter stage2 instead of being flushed as IME input.

5. Right-click copy paste suppression: after right-click copy, text key
   events are suppressed for 2s to prevent VS Code ConPTY from injecting
   duplicate clipboard content as key events.

6. Clipboard CRLF normalization: read_from_system_clipboard() now normalizes
   Windows CRLF line endings to LF, preventing double-spaced paste output.

Also fixes parse_command_line backslash escape reported by @schgoo in psmux#123.
The parser now recognises \\ as an escape sequence inside double quotes
(producing a single \), preventing the closing quote from being consumed
when the client sends send-text "\\".

Co-investigated-by: @ToxMox (psmux#118)
Co-investigated-by: @schgoo (psmux#123)