feat: multi-message send queue aligned with Qoder IDE

[luoxuanzao]

Summary

• Replace the single queued-message slot with a FIFO multi-message send queue, aligned with the Qoder IDE send-queue UI: a collapsible panel above the composer shows "Waiting to send N" with one row per pending turn (drag handle, text preview, edit and delete actions).
• While a response is streaming, further sends stack into the queue instead of replacing the previous pending message; entries drain one per turn end in send order, and rows can be drag-reordered, edited back into the composer, or deleted individually.
• Stop semantics rework: interrupting a streaming turn no longer withdraws queued content into the composer. The queue is preserved as-is and the head entry is still sent after the interrupted turn settles (stop = "skip this turn, continue with the next").
• Queue UI strings localized in all ten locales; queue panel styling aligned with the IDE (bare icon buttons via scoped specificity over Obsidian's default button chrome, rounded row hover, no divider lines).

Verification

• npm run typecheck
• npm run lint
• npm run test (3348 tests, incl. new queued-message-controller suite: FIFO render/drain, per-item edit/delete, drag reorder, collapse/expand, clear)
• npm run build
• npm run release:check
• npm run audit:prod
• Tested affected qodercli behavior against a real CLI when applicable (manual pass in the test vault: multi-enqueue while streaming, collapse, per-item edit/delete, drag reorder, FIFO drain at turn end, stop preserves queue and drains head)

Safety

• No credentials, private vault content, internal URLs, or personal paths are included
• User-visible changes are documented in CHANGELOG.md