- [x] navigation control/actions: seek occurrence of character ('f' forwards, 'F' backwards by default; allow e.g. `2f` for seeking second occurrence instead of first).
- [x] buffer ux improvement: enable mouse scrolling sideways so longer lines are easier to follow and read (e.g. in case they extend beyond the width of the buffer view).
- [x] buffer ux improvement: add toggleable word wrap (no keybinding by default).
- [x] add panes/splits: split current pane above/below (`_`) or left/right (`|`) in Normal mode; navigate panes with Option/Alt+h/j/k/l.
    - shared split layout and directional focus with diff views; independent pane views, shared buffers, and guarded close/force-close actions.
- [x] remove diff viewer's file explorer's `A added M modified...` explanation - it's standard and the explanation doesn't fit in the pane, so it can go.
    - no replacement help footer in diff file lists; reclaim its row for file entries.
- [x] diff view: add character-wise change highlight (enabled by default).
- [x] add tabs: tab support, editor action to open a buffer in a new tab, default tab navigation is `ctrl+option+h/l`, close tab action.
    - per-tab pane layouts, views, explorers, and comparisons; shared buffers, tab bar, and guarded close/force-close actions.
- [x] make diff selector close on escape.
- [x] `:` currently overrides the diff selector input (and maybe other input fields) and spawns the command input on top. this is of course not intended behavior and should be fixed.
- [x] diff view: lsp actions should act as they normally would. if an lsp action would open another file, then the file should be opened in another tab outside the diff view - if the referenced file/symbol is part of the changes in the diff, it should just be opened in the diff view.
    - changed symbol ranges stay in the comparison; other targets open ordinary tabs. Historical text stays immutable; source freshness and failure atomicity are preserved.
- [x] better syntax highlighting for markdown files. color `-` and `1.` from lists.
- [x] automatically reload buffers when underlying file changes outside of vamp if buffer is clean. if buffer is dirty, reject normal write attempts with warning and require forceful write to overwrite underlying file contents.
- [x] diff view: change diff view modes; choose between split and unified diff view (split by default; some key cycles; default should be configurable).
    - Space v cycles split/unified; configurable startup default, dual line numbers, native side focus/editing, and shared highlighting/wrap/excerpts.
- [x] diff view: for split view, change split orientation (left/right vs above/below) - left/right by default.
    - Space s flips orientation; configurable startup default and shared pane geometry/directional focus.
- [x] add `C` and `D` for deleting line from current cursor position (and entering insert mode: `C`); add `Y` for copying line from current cursor position; add `r` for replacing character at cursor position; add `s` for deleting character at current cursor position and entering insert mode; add `d<count>w` for deleting whole words; add `d<count>b` for deleting backwards (same as `d<count>w` but backwards).
- [x] diff view: make foreground of etched areas (where no lines exist) the same dimmed color as the normal gutter text
- [x] copying is pretty slow; optimize performance to reduce latency.
- [x] enable margins in top/bottom bar elements; give the bottom bar's far-right position indicator a default leading margin of 1 column and no trailing margin.
- [x] better fuzzy search when searching revisions and bookmarks (or the git alternatives) in before and after picker for diff view.
- [x] git blame (enabled by default).
- [x] when jumping to lsp definitions, that line should be center of the buffer (currently placed at the top of the buffer view)
- [x] diff view: add ability to mark files as reviewed. this should just put a check mark left of the file modification indicator (e.g., M, A, D, maybe others)
- [x] make `<line>g` go to that line.
- [x] diff view: if the after point is selected to be current working changes (i.e. `@`), diff view should update to include this after point accordingly (and automatically) - i.e. it should move the after point. this should only be the case when the new checkout is ahead of the after point selected. should be enabled by default.
    - descendant-only jj/Git checkout tracking, frozen Before, inactive-tab refresh, and `config.diff_follow_working_copy` opt-out; preserve explorer/layout choices and unsaved buffers.
- [x] buffer picker (with search).
    - `:buffers` / Space b l opens a searchable picker; shared selection bindings, stable IDs, dirty/active marks, cross-tab buffers, and cancellation without switching.
- [x] improve buffer picker and align with the rest of the editor ui/design language.
    - shared floating-panel geometry, cyan border, padded search, aligned normal-brightness IDs/status columns, cyan `*` before the active ID/yellow `+` dirty marks, home-abbreviated paths, blue selection, and dimmed controls; preserve tiny-terminal navigation and switching.
- [ ] sandboxed, revision-specific LSP analysis for historical diff states and historical tabs.
    - current limitation: immutable snapshot buffers still use the live repository as their LSP workspace; cross-file analysis can mix historical text with current disk contents.
    - lazily materialize the complete selected revision, including unchanged files, manifests, and project configuration; run a separate LSP instance rooted in that snapshot.
    - mount historical source read-only and provide isolated writable scratch directories for caches, indexes, and build output; keep historical navigation targets read-only.
    - enforce an OS-level sandbox on the LSP process and every child it spawns, including build scripts and procedural macros. A temporary checkout and read-only editor buffers are not security isolation.
    - deny access to the live checkout, home directory, credentials, and SSH agent; deny network access by default. Additional access or code-execution permissions require explicit approval.
    - fail closed: if these restrictions cannot be enforced, keep read-only viewing available but do not launch historical LSP analysis; never silently fall back to an unrestricted process.
    - retain the snapshot and analysis environment while historical views/tabs reference it; stop workers and clean up disposable storage after the final reference closes.
- [ ] diff view: github integration (code review) - add comments on a pr, add review comments at specific lines of files, request changes, approve pr, etc.
- [ ] diff view: local review comments (same features as for github reviews) that allows review of local changes to deliver specific reviews to ai agents used for coding.
    - design question: would this require a server that the agent can interact with, or would local review files be fine? don't want to use server client stuff, if it would be easier and better to just use local files.
- [ ] remove the diff palette polling fallback once a released Herdr fix delivers palette-ready DEC 2031 notifications, including palette-only changes with an unchanged light/dark preference. Related upstream issue: [herdrdev/herdr#4183](https://github.com/herdrdev/herdr/issues/4183).
    - verify that notification-triggered queries return fresh colors in Ghostty through Herdr before removal; retain startup, focus-regain, and notification-driven palette refresh.
- [ ] pull a pr description and display it in a buffer:
	- open a selector that allows you to pick a pr from remote
	- selector should be searchable
	- selected pr description is opened in a separate buffer/tab.
	- open related pr description directly from diff view (should be able to figure out the relevant pr from the branch involved in the diff - if jj, then from tracked bookmark; if just git, then from branch)