Comprehensive ripgrep search dialog with full option wiring

[bluestreak01]

Summary

• Expands the file search dialog (Ctrl+S) from 4 options to ~30, covering nearly all rg CLI flags
• Wires every option to the underlying grep-regex / grep-searcher / ignore library builders
• Adds auto-complete for file type fields, F1 contextual help on every field, and type-to-filter within search results
• Implements custom Sink for before/after context line support
• 48 tests covering every search option, edge cases, filter, and state management

What changed

Dialog (Ctrl+S)

Section	Fields
Inputs	pattern (-e), replace (-r), path, glob (-g), type (-t), type-not (-T)
Search options	regex, case insensitive (-i), smart case (-S), word regexp (-w), line regexp (-x), invert match (-v), multiline (-U), multiline dot-all, CRLF
Filter options	hidden (-.), follow symlinks (-L), no-ignore, binary as text (-a), search zip (-z), glob case insensitive, one file system, trim whitespace
Limits	before context (-B), after context (-A), max depth (-d), max count (-m), max filesize, encoding (-E)

All fields show their rg short flag in the label. Every option persists across sessions.

Auto-complete & F1 help

• Typing in -t type / -T type-not fields shows a dropdown of matching rg file types (~100 types from ignore::TypesBuilder)
• F1 on any field shows contextual help popup with the rg flag, description, and usage examples
• F1 on type fields → scrollable/filterable type list; F1 on glob → glob pattern reference

Search engine (SearchConfig → builders)

• RegexMatcherBuilder: case_insensitive, case_smart, word, whole_line, multi_line, dot_matches_new_line, crlf, fixed_strings
• SearcherBuilder: invert_match, multi_line, before/after_context, binary_detection, encoding, line_terminator
• WalkBuilder: hidden, git_ignore, follow_links, max_depth, max_filesize, same_file_system, ignore_case_insensitive
• TypesBuilder: select/negate per comma-separated type
• Custom Sink implementation captures both match and context lines
• parse_filesize with K/M/G suffixes and checked_mul overflow protection

Search results panel

• Context lines rendered dimmer (space separator instead of colon)
• Type to filter results in real-time (case-insensitive, matches text and file paths)
• F4 / Enter opens editor at match line; editor close restores focus to search panel
• Help dialog updated with new keybindings

Test plan

• cargo check — compiles
• cargo fmt --check — formatted
• cargo clippy -- -W clippy::all — no warnings
• cargo test — 48 tests pass (all search options, filter, state, edge cases)
• Manual: Ctrl+S, configure options, verify results in opposite panel
• Manual: F1 on each field, auto-complete on type fields
• Manual: Type to filter results, Esc clears filter, F4 opens editor and returns to results

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