Fix select motions and mobile line aliases

KEYMAP.md

@@ -97,17 +97,19 @@ selection entry, leader rails, tool commands, save/quit, and recoverability.
 
 Text-entry mode for ordinary typing. `mim` starts in Normal mode; Insert mode is
 entered explicitly with `i`, `a`, `o`, or another visible command. In Insert mode,
-`Space` commits a literal space immediately. Physical keyboards may use
+`Space` commits a literal space immediately and `Tab` inserts spaces by default
+(expandtab, matching the dotfiles Neovim baseline). Physical keyboards may use
 conventional direct keys such as Escape as aliases back to Normal, but those
 aliases are optional accelerators, not required controls.
 
 ### Select mode
 
 Selection-building mode. Movement extends the active selection by default.
-Selection commands are semantic: select word, line, current indent block,
-matching delimiter pair, enclosing text object, parameter, diagnostic range, and
-visible panel item. Select mode can apply operations such as delete, replace,
-copy, format, code action, or explain to the selection.
+Semantic object selections live behind the match/object rail (`m w`, `m l`,
+`m i`, `m p`, etc.) so bare `h/j/k/l`, word motions, arrows, and mobile line
+aliases keep behaving as selection-extending motions. Select mode can apply
+operations such as delete, replace, copy, format, code action, or explain to the
+selection.
 
 ### Panel mode
 
@@ -179,7 +181,8 @@ such as arrow keys, Home/End, PageUp/PageDown, Escape, or `%`.
 | `O` or `Space o` `a` | open line above and enter Insert |
 | `h` `j` `k` `l` | left/down/up/right where comfortable; arrows are aliases |
 | `w` `b` `e` | word forward/back/end |
-| `0` `$` | line start/end when available; `Space g` `l` opens line targets |
+| `H` `L` | mobile-reachable line start/end aliases |
+| `0` `^` `$` | attached/Vim-style line start/first-nonblank/end aliases; `Space g` `l` opens line targets |
 | `u` | undo |
 | `Space u` `r` | redo |
 | `Space w` | write/save current buffer |