fix: use unicode ellipsis in truncated interface text

[AhsanIqbal-web]

Fixes #47234

What

Follow-up to #45126: converts the remaining ASCII ... truncation suffixes in human-facing interface text to the unicode ellipsis (\u2026), so titles and previews render consistently:

• packages/opencode/src/session/prompt.ts — auto-generated session title truncation (the source of the title the TUI displays)
• packages/session-ui/src/components/session-retry.tsx — retry message preview
• packages/core/src/filesystem/search.ts — search result line preview
• packages/core/src/ripgrep.ts — ripgrep match preview
• packages/codemode/src/tool-runtime.ts — tool catalog description truncation

packages/opencode/src/patch/index.ts:423 (machine-readable patch format: ellipsis to ...) is intentionally left untouched.

Tests

• bun typecheck in packages/opencode, packages/core, packages/session-ui, packages/codemode — all exit 0
• No behavior change beyond the rendered character; string-literal edits only

Notes

Verified on Windows 11 native host. No tests assert the ASCII ... truncation (checked), so no test updates needed.

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