Use unicode ellipsis (…) in remaining truncated interface text (follow-up to #45126)

Problem

#45126 converted ASCII ... to unicode ellipsis (…) in TUI interface text, but the same truncation pattern remains in 5 more places that produce user-visible text: auto-generated session titles, retry message previews, search/ripgrep result previews, and the codemode tool catalog. Titles and previews rendered today show a mix of ... and … depending on where the text originated.

Remaining sites

• packages/opencode/src/session/prompt.ts:249 — auto-generated session title truncation (substring(0, 97) + "...") — this is the source of the title the TUI displays
• packages/session-ui/src/components/session-retry.tsx:34 — retry message preview (slice(0, 80) + "...")
• packages/core/src/filesystem/search.ts:182 — search result line preview (slice(0, 2_000) + "...")
• packages/core/src/ripgrep.ts:269 — ripgrep match preview (slice(0, 2_000) + "...")
• packages/codemode/src/tool-runtime.ts:456 — tool catalog description truncation (slice(0, 119) + "...")

Note

packages/opencode/src/patch/index.ts:423 intentionally normalizes the ellipsis back to ... for the machine-readable patch format — that conversion is correct and left untouched. This change only affects human-facing truncations.

Proposed fix

Convert the five sites to the unicode ellipsis for consistent interface text, matching the style established in #45126.