Continue Moe integration improvements

[elcritch]

Summary

• Fix X11 control-character text events so Backspace and Tab/Shift-Tab work in Moe command and insert modes.
• Guard the shared native text path against single control-character events from X11, Wayland, and Windows, including Wayland key repeat.
• Improve Kosmo Git diff review and forward Moe messages to application logging.
• Widen the Moe help close button and verify the help overlay and editor grid resize correctly.
• Add a regression test for Return creating one visible line even when the backend also commits newline text.
• This branch also contains the resource lifetime and renderer snapshot changes from Harden resource lifetimes and reduce renderer snapshot memory #117 (49b04d9).
• Merged main and updated render assertions for shared FigDraw glyph views.
• Reuse the idle Chronos worker across animation clock starts to avoid leaked selector descriptors; make column sizing coverage account for font metrics.
• Disconnect Git status worker and timer subscriptions before teardown to avoid a macOS Sigils listener-set mutation during proxy destruction.
• Use the active platform shortcut modifier in Kosmo's find-sidebar test and update Kosmo render assertions for shared glyph views.
• Make the remaining find-result and terminal-tab shortcut tests platform-neutral, with required search readiness checks.
• Keep Kosmo application shortcuts working while a terminal tab has focus; make the remaining tab and quit shortcut tests use the active platform profile.
• Keep ARC/ORC address and undefined-behavior checks active while narrowly suppressing LeakSanitizer reports from static FigDraw font caches, OpenGL shader-source copies, Siwin X11 clipboard wrappers, and application-lifetime worker state.
• Suppress the compiler-generated function-type UBSan diagnostic in Nim 2.2.10's system/orc.nim trace callback; application UBSan checks remain active.

Issue verification

• [Kosmo] Backspace in Command Line mode makes it unreactive #105: Backspace in command and insert modes passes the focused regression.
• [Kosmo] Can not cylce through options displayed in command mode #106: Tab and Shift-Tab cycle command completions; committed tab text does not change the command.
• [Kosmo] :help does not display the help in moe and editor pane content not resizing afterwards #107: :help opens, survives resize, dismisses, and leaves the editor grid resizable.
• [Kosmo] Adding a newline in editor adds actually two lines instead of one #116: One Return in an empty insert-mode buffer shows two lines, and a second shows three.

Verification

• Focused Kosmo regressions for these four issues pass on FreeBSD.
• The native input guard test and affected Markdown tests pass on FreeBSD; both Kosmo and NimKit runners compile.
• The full local NimKit runner passes on FreeBSD, including 20 repeated runs of the periodic Git-status test. The full Kosmo runner now reaches its end with only the previously observed FreeBSD workspace-watcher timeout (ignoredSpy.changes); the terminal-tab test and platform shortcut regressions pass.
• The full local integration runner has two FreeBSD-specific terminal-process assertion failures (live PTY output and alternate-screen scrollback); the Linux and macOS CI test jobs will verify those platforms.
• The platform-neutral find-sidebar test and all four issue-specific Kosmo regressions pass on FreeBSD.
• On head 8742ba73, all PR checks pass: Linux/X11 and macOS full test jobs, Linux ARC and ORC ownership sanitizers, all three example bundles, and Linux, FreeBSD, macOS, and Windows builds. LeakSanitizer remains enabled with stack-specific suppressions for upstream FigDraw/Siwin allocations and application-lifetime worker state.

[elcritch]

@Buegel26 have you found any other Moe integration issues? I'm curious if the backspace issue is resolved for you as well.

[Buegel26]

@elcritch Unfortunately backspace is not fixed - seems to be same as before.

Local repo: commit c6ab9b0 (HEAD -> fix/kosmo-command-mode-105-107-pt2, origin/fix/kosmo-command-mode-105-107-pt2)

[Buegel26]

@Buegel26 have you found any other Moe integration issues? I'm curious if the backspace issue is resolved for you as well.

No further issues yet - but I started using moe more often to see how it compares to nvim and to see what else is not as expected or weird in moes integration in kosmo.

[Buegel26]

@elcritch ok found something in main and this branch... interesting...

Updated #105 : #105 (comment)

Create #116

[Buegel26]

Fixes #105 #106 #116 for me

local repo: commit c49aa29 (HEAD -> fix/kosmo-command-mode-105-107-pt2, origin/fix/kosmo-command-mode-105-107-pt2)