Closes #43209 Closes #38121 Starting on the first character. Running `v e` before changes: <img width="410" height="162" alt="image" src="https://github.com/user-attachments/assets/ee13fa29-826c-45c0-9ea0-a598cc8e781a" /> Running `v e` after changes: <img width="483" height="166" alt="image" src="https://github.com/user-attachments/assets/24791a07-97df-47cd-9ef2-171522adb796" /> Change Notes: - Added helix selection sanitation code that directly mirrors the code in the Vim [`visual_motion`](https://github.com/AidanV/zed/blob/b6728c080c5d14ded7002d0276deb5c19d42ed8a/crates/vim/src/visual.rs#L237) method. I kept the comments from the Vim section that explains its purpose. - The above change converted the problem from fixing `v e` to fixing `v w`. Since `w` is treated differently in Helix than in Vim (i.e. `w` in Vim goes to the first character of a word and `w` in Helix goes to the character before a word. Commented [here](https://github.com/AidanV/zed/blob/b6728c080c5d14ded7002d0276deb5c19d42ed8a/crates/vim/src/helix.rs#L132)), the code treats `w` in `HelixSelect` as a motion that differs from the Vim motion in the same way that the function [`helix_move_cursor`](https://github.com/AidanV/zed/blob/b6728c080c5d14ded7002d0276deb5c19d42ed8a/crates/vim/src/helix.rs#L353) separates these behaviors. - Added a regression test Release Notes: - Fixes bug where `Vim::NextWordEnd` in `HelixSelect` would not select whole word.