Add on-device Ask search mode

[nklmilojevic]

Summary

• Adds an Ask search mode: a natural-language request is turned into literal filters by the on-device Apple Intelligence model (FoundationModels), and Lodge applies those filters locally to clipboard text, OCR text, website, source app, and last copy date. Only the request reaches the model — clipboard contents never leave the Mac.
• Ask defers to Return: typing shows "Press Return to search", the first Return builds the plan, a second Return accepts the selected item. Later query edits invalidate a completed plan, and in-flight responses are discarded once the query changes.
• When the model is unavailable (pre-macOS 26, Apple Intelligence off, device ineligible, model not ready) or planning fails, Lodge falls back to exact search and shows why. Every other search mode still works on macOS 14+.
• Plans are validated before use: domains must be plausible hostnames, dates must be real yyyy-MM-dd values, and app/date filters are dropped unless the phrase actually appears in the request, so the model cannot invent filters.
• Link matching detects HTTP(S) URLs inside copied text; github.com also matches its subdomains but not lookalikes such as notgithub.com or github.com.example.org.
• Adds a search-mode menu beside the search field with a live status line, plus availability hints in Settings → General.
• Drive-by fixes: the search field placeholder now updates when the mode changes, and the detail panel copy date uses a single DateFormatter instead of three stacked Text views.

Test plan

• xcodebuild test -scheme Lodge — new coverage in HistoryTests (Return gating, exact-search fallback, stale response discarded) and SearchTests (combined app/type/date/text filters, link and domain matching, filter-evidence rules, relative date ranges across a DST boundary, invalid domain/date rejection)
• On macOS 26 with Apple Intelligence on: pick Ask, run "links from Safari yesterday" and "GitHub links", confirm results and that a second Return pastes the selection
• On macOS 14/15 or with Apple Intelligence off: confirm Ask shows the availability message and returns exact-search results
• Switch modes with text in the field and confirm the placeholder updates

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge with no outstanding actionable findings.

Summary

Adds an on-device Ask search mode that converts natural-language requests into locally applied clipboard filters.

• Adds model-generated and validated filters for text, source applications, content types, dates, and domains.
• Defers Ask execution until Return and falls back to exact search when planning is unavailable or fails.
• Extends link matching to inspect destinations embedded in HTML and RTF clipboard content.
• Adds search-mode controls, availability messaging, tests, and documentation.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  Q[User enters Ask query] --> R[Press Return]
  R --> M[On-device language model]
  M --> V[Validate generated filters]
  V --> S[Search local clipboard history]
  S --> T[Text and OCR]
  S --> A[Source application]
  S --> D[Date range]
  S --> L[Plain-text and rich-content links]
  T --> O[Filtered results]
  A --> O
  D --> O
  L --> O
  M -->|Unavailable or failure| E[Exact-search fallback]
  E --> O

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_{Reviews (2) · Last reviewed commit: "Match hyperlink destinations in Ask link..."}