fix(web): align compact dialog titles

[techotaku39]

Summary

Center titles in compact action and confirmation dialogs, and align the first title line with the close button's horizontal centerline.

Content-heavy dialogs with long or dynamic titles remain left-aligned.

Changes

• Add an opt-in centered-title layout to the shared confirmation dialog.
• Apply it to session archive, delete, and reopen-error dialogs, plus the duplicate-session merge confirmation.
• Use the same layout for rename-session, export-conversation, and external-link confirmation dialogs.
• Reserve symmetric space around centered titles so they remain visually centered without overlapping the close action.
• Use a 24px minimum title row and line height so longer translations can wrap safely on narrow screens.
• Add regression coverage for the centered layout and the unchanged default confirmation-dialog layout.

Testing

• bun run typecheck
• bun run test:web
• bun run build:web
• git diff --check
• Manual verification using the port 3016 test deployment

AI disclosure

Code and tests were prepared with OpenAI GPT-5.6-sol (Codex).

[github-actions]

Findings

• No Blocker, Major, Minor, or Nit findings in the added or modified lines.

Questions

• None.

Summary

• Review mode: initial. Full latest diff reviewed; no correctness, security, regression, data-loss, performance, or maintainability issue found at or above the 80% confidence threshold. Residual risk: the new tests assert layout classes but do not verify rendered geometry when titles wrap on narrow screens.

Testing

• Not run (automation; PR content was not executed during review). The GitHub test check reports pass. Existing added coverage checks centered and default class application; narrow-screen browser geometry remains a manual testing gap.

HAPI Bot

[github-actions]

Findings

• No Blocker, Major, Minor, or Nit findings in the added or modified lines.

Questions

• None.

Summary

• Review mode: follow-up after new commits. Full latest diff reviewed; no correctness, security, regression, data-loss, performance, or maintainability issue found at or above the 80% confidence threshold. The current head has the same Git tree and parent as the previously reviewed commit, so the SHA update introduced no content change. Residual risk: the layout tests assert Tailwind classes but do not verify rendered geometry for wrapped titles at narrow viewport widths.

Testing

• Not run (automation; PR content was not executed during review). The workflow test check was still in progress when inspected. Existing coverage checks centered/default class application; narrow-screen browser geometry remains a manual testing gap.

HAPI Bot

[github-actions]

Findings

• No Blocker, Major, Minor, or Nit findings in the added or modified lines.

Questions

• None.

Summary

• Review mode: follow-up after new commits. Full latest diff reviewed; no correctness, security, regression, data-loss, performance, or maintainability issue found at or above the 80% confidence threshold. The head was rebased onto a newer main; the feature patch remains equivalent, with the duplicate-session confirmation call relocated from web/src/router.tsx to web/src/components/NewSession/index.tsx alongside the upstream refactor. Residual risk: the unit tests verify Tailwind class composition, but rendered geometry for wrapped translations at narrow viewport widths remains covered only by manual verification.

Testing

• Not run (automation; PR content was not executed during review). Existing tests cover the centered opt-in and unchanged default class layout; narrow-screen browser geometry remains a testing gap.

HAPI Bot